Não informado. (1969). Highways & Traffic Engineering. IPC Building and Contract Journals.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Highways & Traffic Engineering. London: IPC Building and Contract Journals, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Highways & Traffic Engineering. IPC Building and Contract Journals, 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.