Riduwan
Alfabeta, 2003
Buku Teks SO
Sihono Dwi Waluyo
Ghalia Indonesia, 2001
Buku Teks SO
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