Παραπομπή APA

Sajwan, K. S., Alva, A. K., & Keefer, R. F. (1999). Biogeochemistry of trace elements in coal and coal combustion byproducts. New York: Kuwler Academic/Plenum Publishers.

Παραπομπή Chicago Style

Sajwan, Kenneth S., Ashok K. Alva, and Robert F. Keefer. Biogeochemistry of Trace Elements in Coal and Coal Combustion Byproducts. New York: Kuwler Academic/Plenum Publishers, 1999.

Παραπομπή MLA

Sajwan, Kenneth S., Ashok K. Alva, and Robert F. Keefer. Biogeochemistry of Trace Elements in Coal and Coal Combustion Byproducts. New York: Kuwler Academic/Plenum Publishers, 1999.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.