Cita APA (7th ed.)
Spann, J. (1923). Alpwirtschaft.
Cita Chicago (17th ed.)
Spann, Joseph. Alpwirtschaft. Freising, 1923.
Cita MLA (9th ed.)
Spann, Joseph. Alpwirtschaft. 1923.
Atenció: Aquestes cites poden no estar 100% correctes.