Craig J. Forsyth e Heith Copes, Encyclopedia of Social Deviance, Sage Publications, 2014, p. 740, ISBN 978-1483364698. URL consultato il 31 gennaio 2021 (archiviato il 1º dicembre 2016).
«Transgender is an umbrella term for people whose gender identities, gender expressions, and/or behaviors are different from those culturally associated with the sex to which they were assigned at birth.»