Não informado. (1969). Issues today: The magazine for high school social studies. American Education Publications, Xerox Education Group.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Issues Today: The Magazine for High School Social Studies. Columbus, Ohio: American Education Publications, Xerox Education Group, 1969.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Issues Today: The Magazine for High School Social Studies. American Education Publications, Xerox Education Group, 1969.
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