APA-referens (7:e uppl.)
NTPC. (2011). Electrical engineering executive trainees recruitment exam study guide. G.K.Publications.
Chicago-referens (17:e uppl.)
NTPC. Electrical Engineering Executive Trainees Recruitment Exam Study Guide. Noida: G.K.Publications, 2011.
MLA-referens (9:e uppl.)
NTPC. Electrical Engineering Executive Trainees Recruitment Exam Study Guide. G.K.Publications, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.