APA (7th ed.) Citation

Keen, M., & Pepperell, L. (1991). Colour your garden: A portfolio of inventive planting schemes. Conran Octopus.

Chicago Style (17th ed.) Citation

Keen, Mary, and Liz Pepperell. Colour Your Garden: A Portfolio of Inventive Planting Schemes. London: Conran Octopus, 1991.

MLA (9th ed.) Citation

Keen, Mary, and Liz Pepperell. Colour Your Garden: A Portfolio of Inventive Planting Schemes. Conran Octopus, 1991.