Keith, D.A.; Ferrer-Paris, J.R.; Nicholson, E.; Kingsford, R.T., eds. (2020). The IUCN Global Ecosystem Typology 2.0: Descriptive profiles for biomes and ecosystem functional groups. Gland, Switzerland: IUCN. doi:10.2305/IUCN.CH.2020.13.en. ISBN978-2-8317-2077-7. S2CID241360441.
Kellogg, Charles (February 1933). "A Method for the Classification of Rural Lands for Assessment in Western North Dakota". The Journal of Land & Public Utility Economics. 9 (1): 12. doi:10.2307/3138756. JSTOR3138756.
Udvardy, M. D. F. (1975). A classification of the biogeographical provinces of the world. IUCN Occasional Paper no. 18. Morges, Switzerland: IUCN, [1].
Kellogg, Charles (February 1933). "A Method for the Classification of Rural Lands for Assessment in Western North Dakota". The Journal of Land & Public Utility Economics. 9 (1): 12. doi:10.2307/3138756. JSTOR3138756.
Lex Comber; et al. (2005). "What Is Land Cover?"(PDF). Environment and Planning B: Planning and Design (32): 199–209. Archived from the original(PDF) on 2018-11-03. Retrieved 2020-12-16.
Lex Comber; et al. (2005). "What Is Land Cover?"(PDF). Environment and Planning B: Planning and Design (32): 199–209. Archived from the original(PDF) on 2018-11-03. Retrieved 2020-12-16.