ISBN 0-273-01120-0*Kermode, A.C. (1972), "Mechanics of Flight", Chapter 3, (p. 76, eighth edition), Pitman Publishing ISBN 0-273-31623-0
ISBN 0-273-01120-0*Kermode, A.C. (1972), "Mechanics of Flight", Chapter 3, (p.76, eighth edition), Pitman Publishing ISBN 0-273-31623-0==Notes==