Singh, Y. P., Pareek, U. N., & Arora, D. R. (1974). Diffusion of an interdiscipline: Social sciences in agriculture education. Published by New Heights for Indian Society of Extension Education : stockists and distributors, Rainbow Book Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Singh, Yogendra Pal, Udai Narain Pareek, و D. R. Arora. Diffusion of an Interdiscipline: Social Sciences in Agriculture Education. Delhi: Published by New Heights for Indian Society of Extension Education : stockists and distributors, Rainbow Book Co., 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Singh, Yogendra Pal, et al. Diffusion of an Interdiscipline: Social Sciences in Agriculture Education. Published by New Heights for Indian Society of Extension Education : stockists and distributors, Rainbow Book Co., 1974.