Here is a list of the Best books on old School Japanese Movies & Posters.
Japanese Movie Posters: Yakuza, Monster, Pink, and Horror by Tetsuya Masuda & Kairakutei Black
The only book in the west only dedicated to the subject. A tribute to lurid imagery and purple prose created by nameless designers at Japanese film studios.
TokyoScope: The Japanese Cult Film Companion by Patrick Macias.
Definitively a must read for every fan of yakuza, monster, horror, pink films.
The yakuza movie book by Mark Schilling
No Borders, No Limits: Nikkatsu Action Cinema
Outlaw Masters of Japanese Film
Stray Dogs & Lone Wolves: The Samurai Film Handbook
Warring Clans, Flashing Blades: A Samurai Film Companion
Silver Screen Samurai: The Best of Japan’s Samurai Movie Posters