Perry, W. J. (1987). Technologies to maintain biological diversity. Washington: Congress of the United States.
استشهاد بنمط شيكاغوPerry, William J. Technologies to Maintain Biological Diversity. Washington: Congress of the United States, 1987.
MLA استشهادPerry, William J. Technologies to Maintain Biological Diversity. Washington: Congress of the United States, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.