Schultz, Henry
The theory and measurement of demand / by Henry Schultz
The Univ. of Chicago Press , 1938
 Buku Teks
Clarckson, Geoffrey
The theory of consumer demand: a critical apparisal / Geoffrey Clarckson
Prentice-Hall, 1962
 Buku Teks
Chirgwin, B.H.
Elementary electromagnetic theory; Vol. 1
Pergamon Press, 1971
 Buku Teks
Lewis, M. L. (Maurice L.)
Electrical installation competences vol. 1 : studies, theory
Stanley Thornes, 1992
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Algebraic methods in graph theory; Vol. 1
edited by L. Lovasz and Vera T. Sos
North-Holland Publishing, 1981
 Buku Teks