Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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