Block, Mervin
Media Development, 2005
Buku Teks
Kangjeng Gusti Pangeran Adipati Arya Mangkunegara VII
[publisher not identified], [date of publication not identified]
Buku Klasik
Badan Penerbit IPWI, 1998
Buku Teks
Tourism, Post & Telecomunication , 1993
Buku Teks
Shanaz Nadine Ariandina Wandy
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
UI - Makalah dan Kertas Kerja