APA (7th ed.) Citation

Carr, E. H. (1972). Socialism in one country, 1924-1926. Penguin Books.

Chicago Style (17th ed.) Citation

Carr, Edward Hallett. Socialism in One Country, 1924-1926. Harmondsworth [etc.]: Penguin Books, 1972.

MLA (9th ed.) Citation

Carr, Edward Hallett. Socialism in One Country, 1924-1926. Penguin Books, 1972.