एपीए उद्धरण

Ravindra Kumar. (1985). Fundamentals of historical geology and stratigraphy of India. Wiley Eastern.

शिकागो स्टाइल उद्धरण

Ravindra Kumar. Fundamentals of Historical Geology and Stratigraphy of India. New Delhi: Wiley Eastern, 1985.

एमएलए उद्धरण

Ravindra Kumar. Fundamentals of Historical Geology and Stratigraphy of India. Wiley Eastern, 1985.