APA aipamena

Thimons, H. F., & H.H. Fields. (1976). Coal: Current Advances in Mining Techniques. M.S.S.

Chicago Style aipamena

Thimons, H.U. Friadrich, and H.H. Fields. Coal: Current Advances in Mining Techniques. New York: M.S.S, 1976.

MLA aipamena

Thimons, H.U. Friadrich, and H.H. Fields. Coal: Current Advances in Mining Techniques. M.S.S, 1976.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.