APA
Leonard.J.N, . (1986). Planets. London: Year Book Medical Publisher Inc.
Chicago
Leonard.J.N, . 1986. Planets. London: Year Book Medical Publisher Inc.
Harvard
Leonard.J.N, . (1986). Planets. London: Year Book Medical Publisher Inc.
MLA
Leonard.J.N, . Planets. London: Year Book Medical Publisher Inc. 1986.
