Vernon, Mark
RajaGrafindo Persada, 2011
Buku Teks
Golinska, Paulina, editor
Springer, 2012
eBooks
edited by Dagmar Caganova, Michal Balog, Lucia Knapcíkova, Jakub Soviar, Serkan Mezarcıoz
Springer Nature, 2019
eBooks
Mascull, Bill
HarperCollins Pub , 1996
Buku Teks
Griffin, Ricky W.
Pearson Education International, 2006
Buku Teks