Fitriati, author
STKIP Bina Bangsa Getsempena. Mathematics Department, 2014
Artikel Jurnal
Hague, Paul, author
Pustaka Binaman Pressindo, 1995
Buku Teks
Handrawan Nadesul, author
Kompas, 2004
Buku Teks
Nurhadi, translator
Gramedia Widiasarana Indonesia, 2004
Buku Teks
Jogiyanto H.M. (Hartono M.), author
BPFE, 2013
Buku Teks