Gaya APA
, ., Penchef, E.
().
Four hoursemen pollution poverty famine violence
.
San:
San Fransisco: Canfield; 1971.
Gaya MLA
, ., Penchef, Esther.
"Four hoursemen pollution poverty famine violence".
San:
San Fransisco: Canfield; 1971,
.
Text.