Jansen, U. H. (1960). Marking and reporting procedures in the secondary schools of Texas. Texas Study of Secondary Education.
Lua i Stíl Chicago (17ú heag.)Jansen, Udo H. Marking and Reporting Procedures in the Secondary Schools of Texas. Austin: Texas Study of Secondary Education, 1960.
Lua MLA (8ú heag.)Jansen, Udo H. Marking and Reporting Procedures in the Secondary Schools of Texas. Texas Study of Secondary Education, 1960.
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