Gaya APA

Williamson, G, I. (2009). Katekismus Singkat Westminster #2: The Shorter Catechism 2 . Surabaya: Momentum.

Gaya MLA

Williamson, G., I.. "Katekismus Singkat Westminster #2: The Shorter Catechism 2". Surabaya: Momentum, 2009. Text.