APA Style
Villegas, Bernardo M.. (1992).
Economics an Introduction 4th edition (1992).
Manila:
Sinag Tala.
Chicago Style
Villegas, Bernardo M..
Economics an Introduction 4th edition.
1992
Manila:
Sinag Tala,
1992.
Text.
MLA Style
Villegas, Bernardo M..
Economics an Introduction 4th edition.
1992
Manila:
Sinag Tala,
1992.
Text.
Turabian Style
Villegas, Bernardo M..
Economics an Introduction 4th edition.
1992
Manila:
Sinag Tala,
1992.
Print.