A PRACTICAL INTRODUCTION WITH EXAMPLES IN SPSS AND STATA. SPRINGER INTERNATIONAL PUBLISHING AG 2019. ISBN 978-3-319-99117-7 ISBN 978-3-319-99118-4 (eBook). https://doi.org/10.1007/978-3-319-99118-4. 185PP

NADEU, E.G. & NADEU, L. (2016). LIBRARY OF CONGRESS CATALOGING IN-PUBLICATION DATA. PRINTED IN THE UNITED STATES OF AMERICA. 158 KENSINGTON DRIVE, MADISON, WI 53704. ISBN 978-0-99

JITONGA, BA. NAIROBI, KENYA 2013. ISBN: 978-9966-1544-39: 194PP

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