Rostow, Walt Whitman, author
A Clarion Book, 1969
Buku Teks
Stebbins, Richard P.
Harper & Brothers, 1955
Buku Teks
Praeger publishers, 1980
Buku Teks
Lary, Hal B.
National Beureau of Economic, 1963
Buku Teks
Stebbins, Richard P.
Harper & Brothers, 1960
Buku Teks