APA

Haanel C. F., . (1977). The master Key, in twenty-four parts with questionnaire and glossary. Marple, Cheshire: Psychology Pub. Co.

Chicago

Haanel Charles F, . 1977. The master Key, in twenty-four parts with questionnaire and glossary. Marple, Cheshire: Psychology Pub. Co.

Harvard

Haanel C. F., . (1977). The master Key, in twenty-four parts with questionnaire and glossary. Marple, Cheshire: Psychology Pub. Co.

MLA

Haanel Charles F, . The master Key, in twenty-four parts with questionnaire and glossary. Marple, Cheshire: Psychology Pub. Co. 1977.