APA Edition Citation

Gupta, D. P., Joshi, K. L., & Sinha, S. Principles of geography Part I: A textbook for Class XI.

Chicago Edition Citation

Gupta, D P., K L. Joshi, and S. Sinha. Principles of Geography Part I: A Textbook for Class XI. New Delhi, NCERT.

MLA Edition Citation

Gupta, D P., et al. Principles of Geography Part I: A Textbook for Class XI.