APA Style
ARIEF, M, I, I. (ttth).
English Pronunciation: the English speech sounds theory & practice, part 1 (1).
Yogyakarta:
Tanpa Penerbit.
MLA Style
ARIEF, M., I., INDRIANI.
"English Pronunciation: the English speech sounds theory & practice, part 1".
1
Yogyakarta:
Tanpa Penerbit,
ttth.
Text.