APA
Colby K. M., . (1951). A primer for psychotherapists. New york: The Ronald Press Company.
Chicago
Colby Kenneth Mark, . 1951. A primer for psychotherapists. New york: The Ronald Press Company.
Harvard
Colby K. M., . (1951). A primer for psychotherapists. New york: The Ronald Press Company.
MLA
Colby Kenneth Mark, . A primer for psychotherapists. New york: The Ronald Press Company. 1951.