Gaya APA

Macfie, E, J., Williamson, E, A. (2010). PANDUAN WISATA KERA BESAR . Switzerland: IUCN.

Gaya MLA

Macfie, Elizabeth, J.., Williamson, Elizabeth, A.. "PANDUAN WISATA KERA BESAR". Switzerland: IUCN, 2010. Text.