Raykov, Tenko, author
Routledge, Taylor & Francis Group, 2008
Buku Teks
Hildebrand, Francis Begnaud, author
Tata McGraw-Hill, 1974
Buku Teks
Parzynski, William R., author
McGraw-Hill, 1987
Buku Teks
Bartle, Robert Gardner, 1927-, author
John Wiley & Sons, 1982
Buku Teks
Atkinson, Kendall E., author
John Wiley & Sons, 1978
Buku Teks