Yap-Diangco, Robert T., author
MCS Enterprises, 1971
Buku Teks
Levine, Michael, author
McGraw-Hill, 2001
Buku Teks
Levinson, Jay Conrad, author
Andi, 2006
Buku Teks
Myrna Carillo Halim, author
Badan Pengembangan Bahasa dan Perbukuan , 2019
Buku Referensi
Mercado, Leonardo N.
Divino World University, 1977
Buku Teks