Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
Čikaški stil citiranja (17. izdanje)Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
MLA način citiranja (9. izdanje)Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.