Graphical Symbols for Use on Equipment, International Standard, Commission Electrotechnique Internationale, International Electrotechnical Commission, Publication 417, First Edition, (Jun. 1973) pp. 5107-5108, 5194z, 5284a, 5302a. |
Symbol Sourcebook, Henry Dreyfuss, Van Nostrand Reinhold, transmitter, converter, signal translator symbols, p. 71, noise symbol, p. 57, floor outlets symbols, p. 49, 1972. |
Corel Gallery Clipart Catalog, Corel Corp, ekg1, ekg2, ekg3 images, p. 228, 1994. |
The Icon Book, William Horton, John Wiley & Sons, Inc., electronic, fast forward, rewind icons, p. 381, incomplete icon, p. 384, 1994. |