Gaya APA

Gray, D, H., Leiser, A, T. (1982). Biotechnical Slope Protection and Erosion Control . New York: Van Nostrand Reinhold Co..

Gaya MLA

Gray, Donald, H., Leiser, Andrew, T. "Biotechnical Slope Protection and Erosion Control". New York: Van Nostrand Reinhold Co., 1982. Text.