APA (7th ed.) Citation

Ian Brookes, Pat Bulhosen, & Robert Groves. (2009). Collins School Dictionary: Easy colour layout (4th.). Harpercollins publications.

Chicago Style (17th ed.) Citation

Ian Brookes, Pat Bulhosen, and Robert Groves. Collins School Dictionary: Easy Colour Layout. 4th. UK: Harpercollins publications, 2009.

MLA (9th ed.) Citation

Ian Brookes, et al. Collins School Dictionary: Easy Colour Layout. 4th. Harpercollins publications, 2009.