Purkey, W. W. (1970). Self concept and school achievement. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Purkey, William Watson. Self Concept and School Achievement. Prentice Hall, 1970.
Lua MLA (9ú heag.)Purkey, William Watson. Self Concept and School Achievement. Prentice Hall, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.