Barnes-Svarney, Patricia L., author
Simon & Schuster , 1999
Buku Teks
Eckholm, Erik P., author
W.W. Norton, 1976
Buku Teks
Academy Group, 1995
Buku Referensi
Tymieniecka, Anna-Teresa, author
Springer, 2012
eBooks
Chukovsky, Nikolai, author
Foreign Languages Publishing House , [Date of publication not identified]
Buku Teks