Powell, L. S. (1973). A guide to the use of visual aids (3rd ed. rev.). British Assoc. for Commercial and Industrial Education.
Citace podle Chicago (17th ed.)Powell, Leonard Sutherland. A Guide to the Use of Visual Aids. 3rd ed. rev. Lond.: British Assoc. for Commercial and Industrial Education, 1973.
Citace podle MLA (8th ed.)Powell, Leonard Sutherland. A Guide to the Use of Visual Aids. 3rd ed. rev. British Assoc. for Commercial and Industrial Education, 1973.
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