Main, Robert S.
Elements of microeconomics / by Robert S. Main and Charles W. Baird
West Pub., 1977
Buku Teks
Population and society: a textbook of readings/ edited by: Charles B. Nam
Hoghton Mifflin, 1968
Buku Teks
Black, Robert H.
Malaria in Australia / Robert H. Black
AGPS, 1972
Buku Teks
MacLaine, Allan H.
Robert Fergusson / by Allan H. MacLaine
Twayne Publishers, 1965
Buku Teks
Ennis, Robert Hugh
Critical thinking/ Robert H. Ennis
Prentice-Hall, 1996
Buku Teks
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