Bleeker, C. J. 1., Bianchi, U. 1., & Bausani, A. 1. (1972). Problems and methods of the history of religions: Proceedings of the study conference organized by the Italian Society for the History of Religions on the occasion of the tenth anniversary of the death of Raffaele Pettazzoni, Rome, 6th to 8th December 1969. Leiden: E. J. Brill.

Bleeker, Claas Jouco 1898-1983, Ugo 1922-1995 Bianchi, and Alessandro 1921-1988 Bausani. Problems and Methods of the History of Religions: Proceedings of the Study Conference Organized By the Italian Society for the History of Religions On the Occasion of the Tenth Anniversary of the Death of Raffaele Pettazzoni, Rome, 6th to 8th December 1969. Leiden: E. J. Brill, 1972.

Bleeker, Claas Jouco 1898-1983, Ugo 1922-1995 Bianchi, and Alessandro 1921-1988 Bausani. Problems and Methods of the History of Religions: Proceedings of the Study Conference Organized By the Italian Society for the History of Religions On the Occasion of the Tenth Anniversary of the Death of Raffaele Pettazzoni, Rome, 6th to 8th December 1969. Leiden: E. J. Brill, 1972.