Gaya APA

Thinkers, T, F. (1993). Thinking Skills Level 1 Shhh, I'm Thinking : Building Problem Solving, Visual Discrimination & Sorting Skills! (Cet. 1). Hongkong: Schofield & Sims Ltd.

Gaya MLA

Thinkers, Tim, Fun. "Thinking Skills Level 1 Shhh, I'm Thinking : Building Problem Solving, Visual Discrimination & Sorting Skills!". Cet. 1 Hongkong: Schofield & Sims Ltd, 1993. Text.