Παραπομπή APA

Garratt, a. (1961). Penguine science survey 1961: 2 part. Penguine Books.

Παραπομπή Chicago Style

Garratt, arthur. Penguine Science Survey 1961: 2 Part. USA: Penguine Books, 1961.

Παραπομπή MLA

Garratt, arthur. Penguine Science Survey 1961: 2 Part. Penguine Books, 1961.