APA (7th ed.) Citation

Ruggiero, G. d. (1921). Modern philosophy. George Allen & Unwin.

Chicago Style (17th ed.) Citation

Ruggiero, Guido de. Modern Philosophy. London: George Allen & Unwin, 1921.

MLA (9th ed.) Citation

Ruggiero, Guido de. Modern Philosophy. George Allen & Unwin, 1921.

Warning: These citations may not always be 100% accurate.