Cita APA (7a ed.)

British Colour Council & Wilson, R. F. (1938). Horticultural colour chart. The British Colour Council.

Cita Chicago Style (17a ed.)

British Colour Council y Robert Francis Wilson. Horticultural Colour Chart. [s.l.]: The British Colour Council, 1938.

Cita MLA (9a ed.)

British Colour Council y Robert Francis Wilson. Horticultural Colour Chart. The British Colour Council, 1938.