APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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