McDonald, Malcolm. Reka bentuk tinjauan soal selidik pendidikan Mohd. Najib Abdul Ghafar - [3rd ed.]. - Oxford ; MA Elsevier/Butterworth-Heinemann c2004. - xxv, 465 p. col. ill. 25 cm. Includes bibliographical references and index. ISBN: 0750659815 Subjects--Topical Terms: Market segmentation.