Mingst, Karen A., author
Norton & Company, 2014
Buku Teks
Rumki Basu
SAGE Publications, 2018
Buku Teks
Krugman, Paul R., author
Addison-Wesley , 1997
Buku Teks
Kaufman, Joyce P, author
Littlefield Publishers, 2013
Buku Teks
Krugman, Paul R., author
RajaGrafindo Persada, 1994
Buku Teks