APA

Greenleaf W. J., . (1955). Occupations and careers. New York: McGraw-Hill.

Chicago

Greenleaf Walter James, . 1955. Occupations and careers. New York: McGraw-Hill.

Harvard

Greenleaf W. J., . (1955). Occupations and careers. New York: McGraw-Hill.

MLA

Greenleaf Walter James, . Occupations and careers. New York: McGraw-Hill. 1955.