APA (7th ed.) Citation

Hagger, A. J. (1950). Air navigation in high latitudes. Polar Record, 5(39), 440.

Chicago Style (17th ed.) Citation

Hagger, A. J. "Air Navigation in High Latitudes." Polar Record 5, no. 39 (1950): 440.

MLA (9th ed.) Citation

Hagger, A. J. "Air Navigation in High Latitudes." Polar Record, vol. 5, no. 39, 1950, p. 440.