Gaya APA

Fletcher, W, E, A. (1986). Exploration Geochemistry: Design and Interpretation of Soil Surveys (1). Mexico: Society of Economic Geologist.

Gaya MLA

Fletcher, W.K., Et, Al.,. "Exploration Geochemistry: Design and Interpretation of Soil Surveys". 1 Mexico: Society of Economic Geologist, 1986. Text.