^ abBoggs, Samuel Whittemore (1945). "This Hemisphere". Journal of Geography. 44 (9): 345–355. doi:10.1080/00221344508986498.Parameter |month= yang tidak diketahui akan diabaikan (bantuan)
^Judy M. Olson (1997). "Projecting the Hemisphere". Matching the Map Projection to the Need. American Congress on Surveying and Mapping. Diakses tanggal 2007-12-14.