Cita APA (7th ed.)

Illing, W., & Grune, E. (1957). Start in den Himmel (1.- 8. Tausend.). Wunderlich.

Cita Chicago (17th ed.)

Illing, Walter, i Edwin Grune. Start in Den Himmel. 1.- 8. Tausend. Leipzig: Wunderlich, 1957.

Cita MLA (8th ed.)

Illing, Walter, i Edwin Grune. Start in Den Himmel. 1.- 8. Tausend. Wunderlich, 1957.