Gaya APA
Dewi, I, K. et al (2019).
Stairway 4: A Fun and Easy English Book for Grade IV of Elementary Schools .
Solo:
Tiga Serangkai.
Gaya MLA
Dewi, Ida, Kusuma. et al.
"Stairway 4: A Fun and Easy English Book for Grade IV of Elementary Schools".
Solo:
Tiga Serangkai,
2019.
Text.