Não informado. (1974). Studies in science education. University of Leeds, Center for Studies in Science Education.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Studies in Science Education. Leeds, Inglaterra: University of Leeds, Center for Studies in Science Education, 1974.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Studies in Science Education. University of Leeds, Center for Studies in Science Education, 1974.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.