APA

Krypton C., Karpovich M. M., . (1953). The northern sea route. New York: Research Program on the U.S.S.R.

Chicago

Krypton Constantine, Karpovich Michael M, . 1953. The northern sea route. New York: Research Program on the U.S.S.R.

Harvard

Krypton C., Karpovich M. M., . (1953). The northern sea route. New York: Research Program on the U.S.S.R.

MLA

Krypton Constantine, Karpovich Michael M, . The northern sea route. New York: Research Program on the U.S.S.R. 1953.