APA (7th ed.) Citation

Gregory, R. (1921). A catalogue of British scientific and technical books: Covering every branch of science and technology carefully classified and indexed. British Science Guild.

Chicago Style (17th ed.) Citation

Gregory, Richard. A Catalogue of British Scientific and Technical Books: Covering Every Branch of Science and Technology Carefully Classified and Indexed. London: British Science Guild, 1921.

MLA (9th ed.) Citation

Gregory, Richard. A Catalogue of British Scientific and Technical Books: Covering Every Branch of Science and Technology Carefully Classified and Indexed. British Science Guild, 1921.