APA (7th ed.) Citation

Stern, R. C. (1977). U-boats in action. Squadron/Signal Publications.

Chicago Style (17th ed.) Citation

Stern, Robert Cecil. U-boats in Action. Carrollton, Tex.: Squadron/Signal Publications, 1977.

MLA (9th ed.) Citation

Stern, Robert Cecil. U-boats in Action. Squadron/Signal Publications, 1977.