Michigan. Rand, 2000. Map.
Japanese Fundamentals. Barron, 1992. Chart.
"Table 311.80: Number and Percentage Distribution of Course Enrollments in Languages Other Than English at Degree-Granting Postsecondary Institutions, by Language and Enrollment Level: Selected Years, 2002 through 2013." Digest of Education Statistics, National Center for Education Statistics, 2015, nces.ed.gov/programs/digest/d15/tables/dt15_311.80.asp.
