Cita APA (7th ed.)
Willwoll, A. (1952). Psychologia metaphysica in usum scholarum. Herder.
Cita Chicago (17th ed.)
Willwoll, Alexander. Psychologia Metaphysica in Usum Scholarum. Friburgo, Alemania: Herder, 1952.
Cita MLA (9th ed.)
Willwoll, Alexander. Psychologia Metaphysica in Usum Scholarum. Herder, 1952.
Atenció: Aquestes cites poden no estar 100% correctes.