Nowell, C. E. (1973). Portugal. Prentice-Hall, Inc.
芝加哥风格引文Nowell, Charles E. Portugal. Englewood Cliffs, New Jersey: Prentice-Hall, Inc, 1973.
MLA引文Nowell, Charles E. Portugal. Prentice-Hall, Inc, 1973.
警告：这些引文格式不一定是100％准确.
APA引文