Greenstein, Carol Horn, author
Van Nostrand Reinhold, 1978
Buku Referensi
Restall, Greg, author
Routledge , 2000
Buku Teks
edited by Jon Barwise; with the cooperation, H.J. Keisler, K. Kunen, Y. N. Moschowakis, A.S. Trioelstra
North-Holland Pub. Co, 1978
Buku Referensi
Ben-Ari, Mordechai, author
Springer, 2012
eBooks
Smarandache, Florentin, author
Hexis, 2005
Buku Teks