Powell, L. S. (1964). A guide to the overhead projector. British Association for Commercial and Industrial Education.
芝加哥风格引文Powell, Leonard Sutherland. A Guide to the Overhead Projector. Lond.: British Association for Commercial and Industrial Education, 1964.
MLA引文Powell, Leonard Sutherland. A Guide to the Overhead Projector. British Association for Commercial and Industrial Education, 1964.
警告：这些引文格式不一定是100％准确.