APA

International Scientific Conference International Federation of Organic Agriculture Movements, Kopke U. & Schulz D. G. (1992). 9th. International scientific conference International Federation of Organic Agriculture Movements. St. Wendel (FRG): Druck im Zentrum.

Chicago

International Scientific Conference International Federation of Organic Agriculture Movements, Kopke U and Schulz D G. 1992. 9th. International scientific conference International Federation of Organic Agriculture Movements. St. Wendel (FRG): Druck im Zentrum.

Harvard

International Scientific Conference International Federation of Organic Agriculture Movements, Kopke U. and Schulz D. G. (1992). 9th. International scientific conference International Federation of Organic Agriculture Movements. St. Wendel (FRG): Druck im Zentrum.

MLA

International Scientific Conference International Federation of Organic Agriculture Movements, Kopke U and Schulz D G. 9th. International scientific conference International Federation of Organic Agriculture Movements. St. Wendel (FRG): Druck im Zentrum. 1992.