Harrer, Heinrich
E.P. Dutton, 1954
Buku Teks
Kallay, Nicholas
Columbia University Press, 1954
Buku Teks
Coudenhove-Kalergi, Richard
Seewald Verlag, 1972
Buku Teks
Yang, Richard
The Forum Press, 1978
Buku Teks
Vandenbosch, Amry, author
University of Kentucky Press, 1957
Buku Teks