This web page can only offer a taster of the Marcos marque, but there are a few books which give more information
(and I've used some as sources for the page)

Marcos Cars 1960-1988Brooklands BooksISBN 1 870642 643/ISBN: 1855203979Collected Road Tests - The later Gold Portfolio has more articles and is widely available still.
Marcos - The story of a Great British SportscarCedar PublishingISBN 0 951 7002 94Jem Marsh's entertaining history of the marque. April 2002 - I spotted a couple in Foyles last week and these weren't signed by Jem, so if you've got a signed one they are different!
Specialist Sports CarsHaynes PublishingISBN 1859606903A not too bulky, but interesting book on British Specialist sportscar - includes Marcos and the Probes of the Adams brothers - Not the same book as the one at the bottom of the list
Flying on Four WheelsPatrick Stephens LtdISBN 0 85059 770 6Frank Costin's biography with some interesting information on the early days at Marcos - now rare and expensive!
British Sportscars in America??A book covering every(?) British Sportscar marque ever sold in the US and a potted history of the marque there - An interesting book, but not easy to find in the UK.
Classic Cars - The Masterpieces??I spotted this in one of those remaindered book shops in Basingstoke. It has a highly detailed section on each of the cars it covers and looks at the evolution of the Marcos coupe and includes a great cutaway shot - Worth getting if you like classic cars at all and especially if you like Marcos cars. Price - 9.99
Fantastic CarsWH Smiths0 86124 351 XA WH Smith's special, but a good section on Marcos - not currently in print - Recently spotted in Book Boyz
Encyclopedia of Classic CarsWH Smiths0 7064 2874 9Another Smith's special, but again a good (if small) section on Marcos - again, currently out of print.
Specialist Sports Cars - British Small Series Production Cars David & Charles Limited ISBN o 7153 6417 0 Lots of information on Marcos, Ginetta and other small British marques

Thanks to Dave McCubbin for some new titles. Any more pointers to books containing Marcos information will be gratefully received.