APA Citation

(2019). Knock! knock!: Who's there? (Cetakan I , Mei 2019.). Bandung: DAR! Mizan.

Chicago Style Citation

Knock! Knock!: Who's There? Cetakan I , Mei 2019. Bandung: DAR! Mizan, 2019.

MLA Citation

Knock! Knock!: Who's There? Cetakan I , Mei 2019. Bandung: DAR! Mizan, 2019.

Warning: These citations may not always be 100% accurate.