APA
Erich Heftmann and Erich Mosettig, . (1987). Biochemistry of Steroids. New York: Pergamon Press.
Chicago
Erich Heftmann and Erich Mosettig, . 1987. Biochemistry of Steroids. New York: Pergamon Press.
Harvard
Erich Heftmann and Erich Mosettig, . (1987). Biochemistry of Steroids. New York: Pergamon Press.
MLA
Erich Heftmann and Erich Mosettig, . Biochemistry of Steroids. New York: Pergamon Press. 1987.