KRISHNA, M. (1990). DEVELOPING COMMUNICATION SKILLS. MACMILLAN.
Lua i Stíl Chicago (17ú heag.)KRISHNA, MOHAN. DEVELOPING COMMUNICATION SKILLS. NEW DELHI: MACMILLAN, 1990.
Lua MLA (9ú heag.)KRISHNA, MOHAN. DEVELOPING COMMUNICATION SKILLS. MACMILLAN, 1990.
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