APA (7th ed.) Citation

Hirmer, M., & Hirmer, E. (2017). GPG: Geschichte, Politik, Geografie. pb-Verlag.

Chicago Style (17th ed.) Citation

Hirmer, Monika, and Erhard Hirmer. GPG: Geschichte, Politik, Geografie. München: pb-Verlag, 2017.

MLA (9th ed.) Citation

Hirmer, Monika, and Erhard Hirmer. GPG: Geschichte, Politik, Geografie. pb-Verlag, 2017.

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