Pusat Kajian Ilmu Ekonomi (Puskanomi) Universitas Indraprasta PGRI, 2016
Majalah, Jurnal, Buletin
University of Melbourne ,
Majalah, Jurnal, Buletin
Grangen, Clive William John, 1934-
Academic Press, 1989
Buku Teks
Mason, Robert D.
McGraw-Hill , 1999
Buku Teks SO
McClave, James T.
Pearson, 2018
Buku Teks SO