APA (7th ed.) Citation

Lasswitz, K., & Lasswitz, E. (1971). Two planets.: Auf zwei Planeten. Southern Illinois University Press.

Chicago Style (17th ed.) Citation

Lasswitz, Kurd, and Erich Lasswitz. Two Planets.: Auf Zwei Planeten. Carbondale: Southern Illinois University Press, 1971.

MLA (9th ed.) Citation

Lasswitz, Kurd, and Erich Lasswitz. Two Planets.: Auf Zwei Planeten. Southern Illinois University Press, 1971.

Warning: These citations may not always be 100% accurate.