APA استشهاد

Blyth, F. G. H. (1974). Geology for engineers (6th ed.). English Language Books Society.

استشهاد بنمط شيكاغو

Blyth, F G H. Geology for Engineers. 6th ed. London: English Language Books Society, 1974.

MLA استشهاد

Blyth, F G H. Geology for Engineers. 6th ed. English Language Books Society, 1974.