Wolfe, T. K.
McGraw-Hill, 1959
Buku Teks
Heady, Earl O., author
Prentice-Hall, 1952
Buku Teks
Nakamura, James I., author
Princeton University Press, 1966
Buku Teks
Report of a SEADAG Rural Development Seminar Meeting, 1969
Buku Teks
Greaves, I. C. (Ida Cecil), 1907-, author
George Allen & Unwih , 1935
Buku Teks