Gaya APA
Doughty, P, L, &, M, F.
(1968).
Huaylas: an andean district in search of progress.
.
Ithaca:
Cornell UP.
Gaya MLA
Doughty, Paul, L., &, Mary, F.Doughty.
"Huaylas: an andean district in search of progress. ".
Ithaca:
Cornell UP,
1968.
Buku.