Langan, J., & John Langan. Reading and study skills. New York, NY: McGraw-Hill Higher Education.
Čikaški stil citiranjaLangan, John, i John Langan. Reading and Study Skills. New York, NY: McGraw-Hill Higher Education.
MLA način citiranjaLangan, John, i John Langan. Reading and Study Skills. New York, NY: McGraw-Hill Higher Education.
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