Gaya APA

STROUD, J., Chusfani, P, D. (2015). Lockwood & co : The whispering skull . Jakarta: Gramedia Pustaka Utama.

Gaya MLA

STROUD, JONATHAN., Chusfani, Poppy, D.. "Lockwood & co : The whispering skull". Jakarta: Gramedia Pustaka Utama, 2015. Text.