Cita APA (7a ed.)

Levitt, E. E. (1967). The psychology of anxiety (ed.). Bobbs-Merrill.

Cita Chicago Style (17a ed.)

Levitt, Eugene E. The Psychology of Anxiety. ed. Indianapolis: Bobbs-Merrill, 1967.

Cita MLA (9a ed.)

Levitt, Eugene E. The Psychology of Anxiety. ed. Bobbs-Merrill, 1967.