Dyfyniad APA

Schlumberger Limited. (1998). Log interpretation charts (1998 ed.). Schlumberger Educational Services.

Dyfyniad Arddull Chicago

Schlumberger Limited. Log Interpretation Charts. 1998 ed. Houston, Tex: Schlumberger Educational Services, 1998.

Dyfyniad MLA

Schlumberger Limited. Log Interpretation Charts. 1998 ed. Schlumberger Educational Services, 1998.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.