APA (7th ed.) Citation

Armstrong, T. (1957). Insurance against ice risks at Sea. Polar Record, 8(56), 421.

Chicago Style (17th ed.) Citation

Armstrong, Terence. "Insurance Against Ice Risks at Sea." Polar Record 8, no. 56 (1957): 421.

MLA (9th ed.) Citation

Armstrong, Terence. "Insurance Against Ice Risks at Sea." Polar Record, vol. 8, no. 56, 1957, p. 421.