Gaya APA

Conkin, B, M, A, C, J, E. (1984). Stratigraphy Foundations and Cocepts . New York: Van Nostrand Reinhold Co..

Gaya MLA

Conkin, Barbara, M., And, Concin,, James, E.. "Stratigraphy Foundations and Cocepts". New York: Van Nostrand Reinhold Co., 1984. Text.