APA (7th ed.) Citation

Hilbers, D., & Woutersen, K. (2019). Madeira: Portugal. Crossbill Guides Foundation.

Chicago Style (17th ed.) Citation

Hilbers, Dirk, and Kees Woutersen. Madeira: Portugal. Arnhem, The Netherlands: Crossbill Guides Foundation, 2019.

MLA (9th ed.) Citation

Hilbers, Dirk, and Kees Woutersen. Madeira: Portugal. Crossbill Guides Foundation, 2019.