Preston, Lee E., author
IBER (Institute of Business and Economic Research), 1966
Buku Teks
MacNamee, Brian
Routledge, 1995
Buku Teks
Park, William W., author
Oxford University Press, 2012
Buku Teks
Aaronson, Emily L., editor; Antonsen, Erik L., editor; Venkatesh, Arjun K., editor; Walls, Ron M., editor; Adler, Jonathan N., editor
Pa. Wolters Kluwer, 2015
Buku Referensi
edited by Mikko Huotari, Jürgen Rüland and Judith Schlehe
Palgrave Macmillan, 2014
Buku Teks