Gaya APA

Pirson, S, J. (s.a)). Electric logging. a study of the self potential curve. ((s.a)). : (s.n) (s.n) (.

Gaya MLA

Pirson, Sylvain, J.. "Electric logging. a study of the self potential curve.". (s.a) : (s.n) (s.n) (, s.a). Text.