United States. Information Agency, Voice of America (Organization), & Heald, H. T. (1970). The world of the engineer. Voice of America, United States Information Agency.
Lua i Stíl Chicago (17ú heag.)United States. Information Agency, Voice of America (Organization), agus Henry T. Heald. The World of the Engineer. Washington, D.C.: Voice of America, United States Information Agency, 1970.
Lua MLA (8ú heag.)United States. Information Agency, et al. The World of the Engineer. Voice of America, United States Information Agency, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.