Birdsall, Stephen S.
Outline of American geography
John Wiley & Sons, 1992
 Buku Teks SO
Johnston, R.J. (Ronald John)
Geography and geographers: Anglo-American human geography since 1945
Routledge, 2016
 Buku Teks SO
Birdsall, Stephen S.
Garis besar : geografi Amerika = Outline of American geography
John Wiley & Sons, 1992
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Geography and the American environment / Edited by Saul B. Cohen
Voice of America Forum Lectures , 1968
 Buku Teks
Cohen, Saul B.
Geography and the American environment / Saul B. Cohen
Vioce of America Forum Lectures , 1968
 Buku Teks SO