United States Library of Congress Classification Division. (1956). Classification. Class P, subclasses PN, PR, PS, PZ: Literature (general), English and American literatures, fiction in English, juvenile literature, with supplementary pages. U. S. Government Printing Office.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUnited States Library of Congress Classification Division. Classification. Class P, Subclasses PN, PR, PS, PZ: Literature (general), English and American Literatures, Fiction in English, Juvenile Literature, with Supplementary Pages. Washington: U. S. Government Printing Office, 1956.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিUnited States Library of Congress Classification Division. Classification. Class P, Subclasses PN, PR, PS, PZ: Literature (general), English and American Literatures, Fiction in English, Juvenile Literature, with Supplementary Pages. U. S. Government Printing Office, 1956.