This document discusses different types of reference materials used in science education, including handbooks, workbooks, and reference books. It provides details on the contents and advantages of each. A teacher's handbook is described as an excellent reference for effective science teaching, containing chapter summaries, objectives, technical terms, activities, and evaluation tools. Science workbooks supplement textbooks by providing practice exercises, assignments, and suggestions for practicals and improvisation. Reference books are sources of confirmed facts that are referenced briefly rather than read thoroughly, and include dictionaries, encyclopedias, and catalogs.