Gaya APA
Pieter, A, N.
(1991).
Vocabulary development skills/ Pieter A.Napa
.
Yogyakarta:
Kanisius.
Gaya MLA
Pieter, A., Napa,.
"Vocabulary development skills/ Pieter A.Napa".
Yogyakarta:
Kanisius,
1991.
Text.