GYMER, R. G. (1977). Chemistry in the natural world. D.C. Heat and Company.
Chicago Style aipamenaGYMER, Roger G. Chemistry in the Natural World. Lexington: D.C. Heat and Company, 1977.
MLA aipamenaGYMER, Roger G. Chemistry in the Natural World. D.C. Heat and Company, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.