APA (7 वां संस्करण) प्रशस्ति पत्र
NTPC. (2011). Electrical engineering executive trainees recruitment exam study guide. G.K.Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
NTPC. Electrical Engineering Executive Trainees Recruitment Exam Study Guide. Noida: G.K.Publications, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
NTPC. Electrical Engineering Executive Trainees Recruitment Exam Study Guide. G.K.Publications, 2011.
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