APA (7 ম সংস্করণ) উদ্ধৃতি

Williams, D. B. (1968). Agricultural extension : farm extension: Services in Australia, Britain and the united states of America. Melbourne U.Pr.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Williams, Donald B. Agricultural Extension : Farm Extension: Services in Australia, Britain and the United States of America. Carlton, Vic: Melbourne U.Pr, 1968.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Williams, Donald B. Agricultural Extension : Farm Extension: Services in Australia, Britain and the United States of America. Melbourne U.Pr, 1968.