Cita APA (7th ed.)

Gibson, G. (1982). Perpetual Motion. McClelland and Steward Limited.

Cita Chicago (17th ed.)

Gibson, Graeme. Perpetual Motion. Toronto, Canadá: McClelland and Steward Limited, 1982.

Cita MLA (9th ed.)

Gibson, Graeme. Perpetual Motion. McClelland and Steward Limited, 1982.