United States. Information Agency, Voice of America (Organization), & Heald, H. T. (1970). The world of the engineer. Voice of America, United States Information Agency.
Citace podle Chicago (17th ed.)United States. Information Agency, Voice of America (Organization), a Henry T. Heald. The World of the Engineer. Washington, D.C.: Voice of America, United States Information Agency, 1970.
Citace podle MLA (8th ed.)United States. Information Agency, et al. The World of the Engineer. Voice of America, United States Information Agency, 1970.
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