APA

Enriroment 89/90, Allen J. e., . (1989). Enviroment 89/90. Virginia USA: The Dushkin Publishing Group.

Chicago

Enriroment 89/90, Allen John editor, . 1989. Enviroment 89/90. Virginia USA: The Dushkin Publishing Group.

Harvard

Enriroment 89/90, Allen J. e., . (1989). Enviroment 89/90. Virginia USA: The Dushkin Publishing Group.

MLA

Enriroment 89/90, Allen John editor, . Enviroment 89/90. Virginia USA: The Dushkin Publishing Group. 1989.