Gaya APA

Creswell, , J, W. (2009). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (Trawas) . New York: Library of Congress Cataloging-in-Publication Data.

Gaya MLA

Creswell, , John, W.. "Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (Trawas)". New York: Library of Congress Cataloging-in-Publication Data, 2009. Text.