Gaya APA
PERSULESSY, G, H. (1988).
Listening Improvement Exercises for Students of English As a Foreighn Language .
Jakarta:
DIKTI.
Gaya MLA
PERSULESSY, George, Herman.
"Listening Improvement Exercises for Students of English As a Foreighn Language".
Jakarta:
DIKTI,
1988.
Buku.