APA (7th ed.) Citation

Gregorio, D. d. (1968). The definition of categories of films.

Chicago Style (17th ed.) Citation

Gregorio, Domenico de. The Definition of Categories of Films. Straßburg, 1968.

MLA (8th ed.) Citation

Gregorio, Domenico de. The Definition of Categories of Films. 1968.

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