(en) William H. Rodda, Inland Marine and Transportation Insurance, Prentice Hall, (lire en ligne). « In the absence of any such statement, Alaska probably would be regarded as a part of the continental United States. »
(en) « Style Manual », National Geographic (consulté le ). « Use contiguous or conterminous for the 48 states. The continental United States comprises the 48 plus Alaska. In Alaskan context, lower forty-eight may be used. »