Não informado. (1969). Ergonomics Abstracts. Birmingham University, Ergonomics Information Analysis Centre.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Ergonomics Abstracts. Birmingham, Inglaterra: Birmingham University, Ergonomics Information Analysis Centre, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Ergonomics Abstracts. Birmingham University, Ergonomics Information Analysis Centre, 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.