APA (7th ed.) Citation

Helbrough, E. (2003). The Usborne Internet-linked book of knowledge. Usborne.

Chicago Style (17th ed.) Citation

Helbrough, Emma. The Usborne Internet-linked Book of Knowledge. London: Usborne, 2003.

MLA (9th ed.) Citation

Helbrough, Emma. The Usborne Internet-linked Book of Knowledge. Usborne, 2003.

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