Dhar, R. Effective communication skills - I (1st.). Vipul Prakashan.
Cita Chicago (17th ed.)Dhar, Raj. Effective Communication Skills - I. 1st. Mumbai: Vipul Prakashan.
Cita MLA (9th ed.)Dhar, Raj. Effective Communication Skills - I. 1st. Vipul Prakashan.
Atenció: Aquestes cites poden no estar 100% correctes.