APA (7th ed.) Citation

Bieber, H. (1975). Portugal ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Bieber, Horst. Portugal. [Sonderdr.]. 1975.

MLA (9th ed.) Citation

Bieber, Horst. Portugal. [Sonderdr.]. 1975.

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