Παραπομπή APA

Laithwaite, E. R. (1970). Propulsion without wheels. English University Press.

Παραπομπή Chicago Style

Laithwaite, E R. Propulsion Without Wheels. London: English University Press, 1970.

Παραπομπή MLA

Laithwaite, E R. Propulsion Without Wheels. English University Press, 1970.