APA (7th ed.) Zitazioa

(1997). U.S. Department of Agriculture: Information on the Condition of the National Plant Germplasm System.

Chicago Style (17th ed.) Zitazioa

U.S. Department of Agriculture: Information on the Condition of the National Plant Germplasm System. 1997.

MLA (9th ed.) Zitazioa

U.S. Department of Agriculture: Information on the Condition of the National Plant Germplasm System. 1997.

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