Gaya APA
Vernom, R., Wells, L, T. (1981).
Economic environment of international business (3rd.ed.).
Englewood Cliffs:
Prentice-Hall.
Gaya MLA
Vernom, Raymod., Wells, Louis, T..
"Economic environment of international business".
3rd.ed.
Englewood Cliffs:
Prentice-Hall,
1981.
Text.