Williams, B. R. (1967). Technology, investment and growth. Chapman & Hall.
Lua i Stíl Chicago (17ú heag.)Williams, Bruce Rodda. Technology, Investment and Growth. London: Chapman & Hall, 1967.
Lua MLA (9ú heag.)Williams, Bruce Rodda. Technology, Investment and Growth. Chapman & Hall, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.