Cita APA (7th ed.)
Hefti, W. (1980). Tramway Lokomotiven. Birkhäuser.
Cita Chicago (17th ed.)
Hefti, Walter. Tramway Lokomotiven. Basel, Boston, Stuttgart: Birkhäuser, 1980.
Cita MLA (9th ed.)
Hefti, Walter. Tramway Lokomotiven. Birkhäuser, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.