Cita APA (7th ed.)

Harley, B. (1990). Constructional Toys. Shire Publications Ltd..

Cita Chicago (17th ed.)

Harley, Basil. Constructional Toys. Buckinghamshire: Shire Publications Ltd., 1990.

Cita MLA (8th ed.)

Harley, Basil. Constructional Toys. Shire Publications Ltd., 1990.