APA (7th ed.) Citation

Ruggiero, G. d. Modern philosophy. George Allen and Unwin.

Chicago Style (17th ed.) Citation

Ruggiero, Guido de. Modern Philosophy. George Allen and Unwin.

MLA (8th ed.) Citation

Ruggiero, Guido de. Modern Philosophy. George Allen and Unwin.

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