Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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