APA

Cox P. W. L., Duffy J. C., . (1948). Basic principles of guidance. New York: Prentice-Hall.

Chicago

Cox Philip Wescott Lawrance, Duffy John Carr, . 1948. Basic principles of guidance. New York: Prentice-Hall.

Harvard

Cox P. W. L., Duffy J. C., . (1948). Basic principles of guidance. New York: Prentice-Hall.

MLA

Cox Philip Wescott Lawrance, Duffy John Carr, . Basic principles of guidance. New York: Prentice-Hall. 1948.