APA
Birnbaum S. e., Birnbaum S. e. C. e. D. e., . (1981). Penguin Travel Guides Europe 1981-82. England: Penguin Books.
Chicago
Birnbaum Stephen ed, Birnbaum Stephen ed./Hardiman Claire ed./Walker David ed, . 1981. Penguin Travel Guides Europe 1981-82. England: Penguin Books.
Harvard
Birnbaum S. e., Birnbaum S. e. C. e. D. e., . (1981). Penguin Travel Guides Europe 1981-82. England: Penguin Books.
MLA
Birnbaum Stephen ed, Birnbaum Stephen ed./Hardiman Claire ed./Walker David ed, . Penguin Travel Guides Europe 1981-82. England: Penguin Books. 1981.