Cita APA (7a ed.)

Nowell, C. E. (1973). Portugal. Prentice-Hall, Inc.

Cita Chicago Style (17a ed.)

Nowell, Charles E. Portugal. Englewood Cliffs, New Jersey: Prentice-Hall, Inc, 1973.

Cita MLA (9a ed.)

Nowell, Charles E. Portugal. Prentice-Hall, Inc, 1973.