Creswell, John Ward, 1945- Research Design : qualitative, Quantitative, and Mixed Methods Approaches / John W. Creswell. -- 3rd Edit. -- Los Angeles : SAGE Publications, 2009. -- xxix, 260 s. : obr., tab. ; 25 cm. -- ISBN 978-1-4129-6556-9 (viaz.) : 95,16 EUR

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