Here are my recommended books and articles:

K. Eguchi, Absolute Pitch Training Programme (Tokyo, 2000)

K. Eguchi & S. Eguchi, Absolute Pitch Training Programme - New edition (Tokyo, 2001)

S. Eguchi, Absolute Pitch Training Programme Q&A (Tokyo, 2003)

S. Eguchi, Absolute Pitch Q&A (Tokyo, 2000)

K. Fukuzato, Donnakomo 100% Zettaionnkann ga tsuku (Tokyo, 2003)

T. Kinoshita, Watashi no Onkan Kyouiku (Tokyo, 2000)

D. Levitin, ‘Précis to an integrated Absolute pitch: Review’, Bulletin of Psychology and the Arts, 4 (2003), 17-19

D. Levitin & S. Rogers ‘Absolute pitch: perception, coding, and controversies’, TRENDS in Cognitive Sciences, 9 (2005), 26-33

K. Miyazaki, ‘How well do we understand absolute pitch?’ Acoust. Sci. & Tech. 25, 6 (2004), 426-432

K. Miyazaki, ‘Musical pitch identification by absolute pitch possessors’, Perception & Psychophysics, 44 (1988), 501-512

K. Miyazaki, ‘Perception of relative pitch with different references: Some absolute- pitch listener can’t tell musical intervals names’, Perception & Psychophysics, 57 (1995), 962-970

H. Saisyo, Absolute Pitch (Tokyo, 2002)

A. Sakakibara, ‘Why are people able to acquire absolute pitch only during early childhood? : Training age and acquisition of absolute pitch’ The Japanese journal of education psychology 52 (2004) 485-496

T. Sakata, Youji no Onkan Kyouiku Text (Tokyo, 2001)

 T. Shiobara, Youji no Sokojikara (Tokyo, 2008)