APA

Barr J., . (1971). The Envıronmental Handbook. London: Association With Pan BOOK.

Chicago

Barr John, . 1971. The Envıronmental Handbook. London: Association With Pan BOOK.

Harvard

Barr J., . (1971). The Envıronmental Handbook. London: Association With Pan BOOK.

MLA

Barr John, . The Envıronmental Handbook. London: Association With Pan BOOK. 1971.