Nkhoma, Mike. A comparison of diagrams and models as instructional aids in the lea rning of chemical structure and bonding at `A' level / by Mike Nkhom a. - Kampala , 1993. - xvi, 120 p. ; 30 cm. Unpubished thesis (M.Ed.) -- Makerere University, 1993. Includes bibliographical references (p.87-89). Subjects--Topical Terms: Chemistry--Study and teaching (Secondary). Dewey Class. No.: 540.7