APA Citation

Koestler, A. 1., & Koestler, A. 1. (1988). Kepler. Barcelona: Salvat.

Chicago Style Citation

Koestler, Arthur 1905-1983, and Arthur 1905-1983 Koestler. Kepler. Barcelona: Salvat, 1988.

MLA Citation

Koestler, Arthur 1905-1983, and Arthur 1905-1983 Koestler. Kepler. Barcelona: Salvat, 1988.

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