Symington, M. (1997). Portugal. Penguin Company.
Chicago Style (17th ed.) CitationSymington, Martin. Portugal. Penguin Company, 1997.
MLA引文Symington, Martin. Portugal. Penguin Company, 1997.
警告：這些引文格式不一定是100％准確.
APA引文
Symington, M. (1997). Portugal. Penguin Company.
Chicago Style (17th ed.) CitationSymington, Martin. Portugal. Penguin Company, 1997.
MLA引文Symington, Martin. Portugal. Penguin Company, 1997.