Gaya APA
Penchef, Esther. (1971).
Four horsemen : pollution, poverty, famine, violence .
Amerika Serikat:
Canfield Press.
Gaya Chicago
Penchef, Esther.
Four horsemen : pollution, poverty, famine, violence.
Amerika Serikat:
Canfield Press,
1971.
Text.
Gaya MLA
Penchef, Esther.
Four horsemen : pollution, poverty, famine, violence.
Amerika Serikat:
Canfield Press,
1971.
Text.
Gaya Turabian
Penchef, Esther.
Four horsemen : pollution, poverty, famine, violence.
Amerika Serikat:
Canfield Press,
1971.
Print.