APA (7th ed.) Zitazioa
NTPC. (2011). Electrical engineering executive trainees recruitment exam study guide. G.K.Publications.
Chicago Style (17th ed.) Zitazioa
NTPC. Electrical Engineering Executive Trainees Recruitment Exam Study Guide. Noida: G.K.Publications, 2011.
MLA (9th ed.) Zitazioa
NTPC. Electrical Engineering Executive Trainees Recruitment Exam Study Guide. G.K.Publications, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.