APA

Kopp G., . (2004). Planet 1. Ismaning: Hueber.

Chicago

Kopp G, . 2004. Planet 1. Ismaning: Hueber.

Harvard

Kopp G., . (2004). Planet 1. Ismaning: Hueber.

MLA

Kopp G, . Planet 1. Ismaning: Hueber. 2004.