Gaumont British Picture Corp, Criterion Collection (Firm), Hitchcock, A., Donat, R., Carroll, M., Mannheim, L., & Buchan, J. (1999). The 39 steps. Criterion Collection.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGaumont British Picture Corp, Criterion Collection (Firm), Alfred Hitchcock, Robert Donat, Madeleine Carroll, Lucie Mannheim, और John Buchan. The 39 Steps. [Chicago, Ill.]: Criterion Collection, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGaumont British Picture Corp, et al. The 39 Steps. Criterion Collection, 1999.
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