APA (7th ed.) Citation

Macgregor, C., & Davies, S. My favourite colour. Ladybird Books.

Chicago Style (17th ed.) Citation

Macgregor, Catriona, and Sumiko Davies. My Favourite Colour. London: Ladybird Books.

MLA (9th ed.) Citation

Macgregor, Catriona, and Sumiko Davies. My Favourite Colour. Ladybird Books.

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