Tyagi, V. P., & Jain, R. K. (1990). Basics for Beginners. S. Chand & Company.
Cita Chicago (17th ed.)Tyagi, V. P., i R. K. Jain. Basics for Beginners. New Delhi: S. Chand & Company, 1990.
Cita MLA (9th ed.)Tyagi, V. P., i R. K. Jain. Basics for Beginners. S. Chand & Company, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.