Gould, J., Nove, A., & King, M. D. (1968). Penguin Social Sciences Survey. Harmondsworth: Penguin Books.
Lua i Stíl Chicago (17ú heag.)Gould, Julius, Alec Nove, agus Michael D. King. Penguin Social Sciences Survey. Harmondsworth: Penguin Books, 1968.
Lua MLA (8ú heag.)Gould, Julius, et al. Penguin Social Sciences Survey. Harmondsworth: Penguin Books, 1968.
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