Gaya APA

, ., Merrick, W. (1998). Key Stage 2: Science Textbook, B 5-6 (Key stage 2 science textbooks) . Letts Educational, 1998: Letts Educational, 1998.

Gaya MLA

, ., Merrick, William. "Key Stage 2: Science Textbook, B 5-6 (Key stage 2 science textbooks)". Letts Educational, 1998: Letts Educational, 1998, 1998. .