APA-viite (7. p.)

Zapf, H. Ecological thought and literature in Europe and Germany: Hubert Zapf. A Global History of Literature and the Environment.(2016).

Chicago-viite (17. p.)

Zapf, Hubert. "Ecological Thought and Literature in Europe and Germany: Hubert Zapf." A Global History of Literature and the Environment.(2016) .

MLA-viite (8. p.)

Zapf, Hubert. "Ecological Thought and Literature in Europe and Germany: Hubert Zapf." A Global History of Literature and the Environment.(2016), .