APA引文

Steves, R., Green, B., Kotz, S., Leutzinger, R., & Openshaw, G. (2025). Rick Steves' Portugal 2025 (Thirteenth edition.). Avalon Travel.

Chicago Style (17th ed.) Citation

Steves, Rick, Ben Green, Suzanne Kotz, Rosie Leutzinger, and Gene Openshaw. Rick Steves' Portugal 2025. Thirteenth edition. Berkeley, Calif.: Avalon Travel, 2025.

MLA引文

Steves, Rick, et al. Rick Steves' Portugal 2025. Thirteenth edition. Avalon Travel, 2025.

警告：這些引文格式不一定是100％准確.