APA
Opie L H, . (1984). The heart. London: Grune and Stratton Inc.
Chicago
Opie L H, . 1984. The heart. London: Grune and Stratton Inc.
Harvard
Opie L H, . (1984). The heart. London: Grune and Stratton Inc.
MLA
Opie L H, . The heart. London: Grune and Stratton Inc. 1984.
