Gaya APA
Mansur, W., Oktavia, W.
(2017).
Be calm, be strong, be grateful
(
Cet. 1)
.
Jakarta:
Kata Depan.
Gaya MLA
Mansur, Wirda., Oktavia, Widyawati.
"Be calm, be strong, be grateful".
Cet. 1
Jakarta:
Kata Depan,
2017.
Text.