Patterson, George N.
The Uniquet frontier : border tensions in the Sino-Soviet conflict
International Studies Group, 1966.
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Shulman, Marshall D.
East-West tensions in the third world
W.W. Norton, 1986
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Quality and qualities: tensions in education reforms
edited by Clementina Acedo, Don Adams and Simona Popa
Sense, 2012
 eBooks
Cole, John W.
The Hidden frontier
Academic Press, 1974
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Dobson, Rosemary
Over the frontier
Angus & Robertson, 1978
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