Ritonga, Abdulrahman
Lembaga Penerbit Fakultas Ekonomi Universitas Indonesia, 1987
Buku Teks SO
Shrestha, Nagendra, supervisor
Salemba Empat, 2007
Multimedia
Shrestha, Nagendra, supervisor
Salemba Empat, 2007
Multimedia
Sudjana
Tarsito, 1988
Buku Teks SO
Zanten, Wim van
Gramedia, 1982
Buku Teks SO