Balfour, A. C., Ohlsen, B., McCarthy, C., Matchar, E., Benchwick, G., & St. Louis, R. (2021). National parks of America (Second edition.). Lonely Planet Global Limited.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBalfour, Amy C., Becky Ohlsen, Carolyn McCarthy, Emily Matchar, Greg Benchwick, और Regis St. Louis. National Parks of America. Second edition. Franklin, TN: Lonely Planet Global Limited, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBalfour, Amy C., et al. National Parks of America. Second edition. Lonely Planet Global Limited, 2021.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.