APA (7th ed.) Citation

(1973). Permafrost: North American contrib., 2. internat. conference, 13 - 28 July 1973, Yakutsk, USSR. Nat. Acad. of Sciences.

Chicago Style (17th ed.) Citation

Permafrost: North American Contrib., 2. Internat. Conference, 13 - 28 July 1973, Yakutsk, USSR. Washington, DC: Nat. Acad. of Sciences, 1973.

MLA (9th ed.) Citation

Permafrost: North American Contrib., 2. Internat. Conference, 13 - 28 July 1973, Yakutsk, USSR. Nat. Acad. of Sciences, 1973.