There is an extensive account of the history of the town in the Lewis transcription - see under Directories.
A history of the town and county of Haverfordwest, Llandysul, Gwasg Gomer (1999) 272 p.
Blacklaw-Jones, Richard. A previously unknown C17 token from Haverfordwest (NLW's site) Pemb Historian X
Brown, J., Phillips, J.W., and Warren. F.J. The history of Haverfordwest with that of some Pembrokeshire parishes.Originally written by the late John Brown and added to by J.W.Phillips & Fred J.Warren . Published by subscription 1914. Here is an Index by Pat Powell .
Also, the complete book is accessible on the Internet Archive site (click on Texts and search on Haverfordwest)
Charles, B.G., (Ed.). Calendar of the records of the Borough of Haverfordwest, 1539-1660, Cardiff, University of Wales Press,1967, 274 p.
Haverfordwest and its story; with Old Pembrokeshire parishes: their traditions, histories, and memories, Haverfordwest, L. Brigstocke (1882) 172 p.
Honey Harfat : a Haverfordwest miscellany : Haverfordwest town and county, 1479-1979 .Newport, Greencroft Books, 1979. 65p
Freeman, E. Historic Haverfordwest, Newport, E. Freeman (1960) 30 p.
Hancock, Simon. The seventeenth-century token of Haverfordwest with an interesting design (NLW's site) Pemb Historian IV
Hancock, Simon L Jacob Wolford: a seventeenth century token issuer in Haverfordwest The Journal of the Pembrokeshire Historical Society, No.3 1989 Welsh Journals Online
Hancock, Simon A seventeenth century token of Haverfordwest with an interesting design The Journal of the Pembrokeshire Historical Society, No.4 1990/91 Welsh Journals Online
Hancock, S L William Nichol and the Marian reaction The Journal of the Pembrokeshire Historical Society, No.2, 1986-7 Welsh Journals Online
Howells, John, of Haverfordwest. Haverfordwest and the Plague, 1652 . Welsh History Review 12 (1985), p. 411-19
James, Douglas D. The town and county of Haverfordwest and its story, Haverfordwest, J.W. Hammond (1958) 172 p.13 b/w illus.[LDS GS 942.99/H1 H2j]
James, Douglas G. Historical Notes on Haverfordwest.
James, Terrence The origins and topography of medieval Haverford The Journal of the Pembrokeshire Historical Society, No.4 1990/91 Welsh Journals Online
Lewis, D J. Reminiscences of Haverfordwest in the early part of this century[C20]. Dyfed FHS journal Vol 5/2 Dec 1994.
Lowe, Vera. My Haverfordwest Childhood 1918-1938. Haverfordwest Civic Society; First Edition (1993)
Miles, Dillwyn. A History of Haverfordwest ; Gomer 1999....Indexed. Listed in Gomer's 2002 Catalogue (1 85902 738 5);- "...an impressive range of distinguished contributors trace the history of Haverfordwest from its earliest settlement through to the medieval borough that grew up around the castle, and finally to the thriving town of the twentieth century."
Miles, Dillwyn. The town and county of Haverfordwest : its freemen and its charities.Gild of Freemen of Haverfordwest,  24p
Miles, D. Sheriffs of the county of Pembroke, 1541- 1974: together with a list of the sheriffs of the town and county of Haverfordwest, C. I. Thomas & Sons (1976) 109 p.
Nisbet, Robert .Under the hills : a memoir: Haverfordwest 1945-1962.Haverfordwest Civic Society,1999.68 p.
Oliver, Gerald. Haverfordwest - stones of the town : the history of Haverfordwest traced through its architecture. Pembrokeshire Life .Oct 1989, p.12-14
Owen, H. A calendar of the public records relating to Pembrokeshire. Vol 1. The lordship, castle, and town of Haverford, Cymmrodorion record series, no. 7. London, Honourable society of Cymmrodorion (1911-1918).
Phillips, W D. Old Haverfordwest
Richards, W.L. Changing face of Haverfordwest. Haverfordwest Civic Society (1992) 150 p.
Sinnett, Charles E. Haverfordwest in the early 1850s, Portfield Fair & The Coming of the Railway