Four books ...
‘The Photographer’s Master Printing Course’. (Mitchell Beazley Photography)

‘The Master Photographer's Lith Printing Course’: A Definitive Guide to Creative Lith Printing. (Argentum)

‘The Master Photographer’s Toning Book’ The Definitive Guide. (Argentum)
(in the USA: ‘The Photographer’s Toning Book’ The Definitive Guide.)

‘The World of Lith Printing’ The Best of Traditional Darkroom and Digital Lith Printing Techniques. (Argentum) Soft back & hardback limted editions.

Several hundred published articles, including feature writer for Photo Art International throughout its life, a master printing series for Amateur Photographer thru' 92-93 (I think!), many other one off & series articles in numerous publications in UK, US, Australia etc, and one or two on the internet.