APA (7th ed.) Zitazioa

(2016). Oil, gas and mineral title examination course (TXCLE).

Chicago Style (17th ed.) Zitazioa

Oil, Gas and Mineral Title Examination Course (TXCLE). 2016.

MLA (9th ed.) Zitazioa

Oil, Gas and Mineral Title Examination Course (TXCLE). 2016.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.