APA (7th ed.) Citation

Fraenger, W., & Frommel, W. (1990). Der Briefwechsel in den Jahren 1947 - 1963. Castrum Peregrini.

Chicago Style (17th ed.) Citation

Fraenger, Wilhelm, and Wolfgang Frommel. "Der Briefwechsel in Den Jahren 1947 - 1963." Castrum Peregrini 1990.

MLA (8th ed.) Citation

Fraenger, Wilhelm, and Wolfgang Frommel. "Der Briefwechsel in Den Jahren 1947 - 1963." Castrum Peregrini, 1990.

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