APA (7th ed.) Citation

Keefe, E. K. (1977). Area handbook for Portugal. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Keefe, Eugene K. Area Handbook for Portugal. Washington, D.C: U.S. Government Printing Office, 1977.

MLA (9th ed.) Citation

Keefe, Eugene K. Area Handbook for Portugal. U.S. Government Printing Office, 1977.