APA

Baller C., Eckebrecht H., .Natura Abiturtraining. Stuttgart: .

Chicago

Baller Carla, Eckebrecht Hanna, .Natura Abiturtraining. Stuttgart: .

Harvard

Baller C., Eckebrecht H., .Natura Abiturtraining. Stuttgart: .

MLA

Baller Carla, Eckebrecht Hanna, .Stuttgart: . .