Cole, John W., author
Academic Press, 1974
Buku Teks
Capra, Fritjof, author
Harper Collins, 2002
Buku Teks
Roy, Gabrielle, author
McClelland and Steward, 1975
Koleksi Publik
Roy, Gabrielle, author
McClelland and Steward, 1975
Buku Teks
Packard, Vance, author
Penguin, 1960
Buku Teks