Thornley, G. C. (1958). Who did it first! Longman.
Cita Chicago (17th ed.)Thornley, G. C. Who Did It First! Londres: Longman, 1958.
Cita MLA (9th ed.)Thornley, G. C. Who Did It First! Longman, 1958.
Atenció: Aquestes cites poden no estar 100% correctes.