Purkey, W. W. (1970). Self concept and school achievement. Prentice Hall.
Čikaški stil citiranja (17. izdanje)Purkey, William Watson. Self Concept and School Achievement. Prentice Hall, 1970.
MLA način citiranja (9. izdanje)Purkey, William Watson. Self Concept and School Achievement. Prentice Hall, 1970.
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