BAK . Denkmäler unserer Träume Rolf Kallenbach 1977 München, p. 126, ill. 36.
BAK paintings of the last decade Paul T. Nagano, A. Kaufman 1976 New York, NY, p. 119, ill.
BAK . Works of the Last Decade Barry Schwartz 1975 Boston, MA / Waltham, ill.
Samuel Bak: The Eternal Enigma Paul T. Nagano 1971 Boston, MA, ill.