Rooprai, Y. K. (2012). Industrial psychology. Wisdom Publication.
Lua i Stíl Chicago (17ú heag.)Rooprai, Yashpal Kaur. Industrial Psychology. New Delhi: Wisdom Publication, 2012.
Lua MLA (9ú heag.)Rooprai, Yashpal Kaur. Industrial Psychology. Wisdom Publication, 2012.
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