Gaya APA
Len, E.
(1989).
Scondary Vocabulary Guaide and Practice 2 / Evelyn Len
.
Jakarta:
Binarupa Aksara.
Gaya MLA
Len, Evelyn.
"Scondary Vocabulary Guaide and Practice 2 / Evelyn Len".
Jakarta:
Binarupa Aksara,
1989.
Buku.