Não informado. (1974). Continuing higher education. Association of University Evening Colleges.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Continuing Higher Education. North Dartmouth, Mass: Association of University Evening Colleges, 1974.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Continuing Higher Education. Association of University Evening Colleges, 1974.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.