Gregory, R. (1923). Discovery: Or the spirit and service of science ("First edition June 1916. Reprinted ... 1923.".). The Macmillan company.
Chicago-referens (17:e uppl.)Gregory, Richard. Discovery: Or the Spirit and Service of Science. "First edition June 1916. Reprinted ... 1923.". New York: The Macmillan company, 1923.
MLA-referens (9:e uppl.)Gregory, Richard. Discovery: Or the Spirit and Service of Science. "First edition June 1916. Reprinted ... 1923.". The Macmillan company, 1923.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.