Cita APA (7th ed.)

Heissenbuttel, H. (1960). Textbuch. Walter.

Cita Chicago (17th ed.)

Heissenbuttel, Helmut. Textbuch. Olten, Switzerland: Walter, 1960.

Cita MLA (8th ed.)

Heissenbuttel, Helmut. Textbuch. Walter, 1960.