Haas, G. (1969). Essay. Metzler.
Cita Chicago (17th ed.)Haas, Gerhard. Essay. Stuttgart: Metzler, 1969.
Cita MLA (8th ed.)Haas, Gerhard. Essay. Metzler, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)