J. M. Ramsden, Propfans—'the genie is out of the bottle' (PDF), in Flight International, vol. 129, n. 3999, New Delhi, India, February 22, 1986, p. 8, ISSN 0015-3710 (WC · ACNP). URL consultato il 17 maggio 2019.
David Learmount, Propfan: the price factor, in Flight International, Seattle, Washington and Long Beach, California, USA, June 13, 1987, pp. 76–79, ISSN 0015-3710 (WC · ACNP). URL consultato il 19 maggio 2019.
J. M. Ramsden, Propfans—'the genie is out of the bottle' (PDF), in Flight International, vol. 129, n. 3999, New Delhi, India, February 22, 1986, p. 8, ISSN 0015-3710 (WC · ACNP). URL consultato il 17 maggio 2019.
David Learmount, Propfan: the price factor, in Flight International, Seattle, Washington and Long Beach, California, USA, June 13, 1987, pp. 76–79, ISSN 0015-3710 (WC · ACNP). URL consultato il 19 maggio 2019.
J. M. Ramsden, Propfans—'the genie is out of the bottle' (PDF), in Flight International, vol. 129, n. 3999, New Delhi, India, February 22, 1986, p. 8, ISSN 0015-3710 (WC · ACNP). URL consultato il 17 maggio 2019.
David Learmount, Propfan: the price factor, in Flight International, Seattle, Washington and Long Beach, California, USA, June 13, 1987, pp. 76–79, ISSN 0015-3710 (WC · ACNP). URL consultato il 19 maggio 2019.