एपीए उद्धरण

(2014). P. S. C. previous questions and answers in civil engineering (3rd ed.). Electron College of Technology.

शिकागो स्टाइल उद्धरण

P. S. C. Previous Questions and Answers in Civil Engineering. 3rd ed. Kollam: Electron College of Technology, 2014.

एमएलए उद्धरण

P. S. C. Previous Questions and Answers in Civil Engineering. 3rd ed. Electron College of Technology, 2014.