APA (7th ed.) Citation

Graf, D., & Schleier, E. (1973). Some unknown works by Guglielmo Cortese.

Chicago Style (17th ed.) Citation

Graf, Dieter, and Erich Schleier. Some Unknown Works by Guglielmo Cortese. 1973.

MLA (9th ed.) Citation

Graf, Dieter, and Erich Schleier. Some Unknown Works by Guglielmo Cortese. 1973.

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