APA (7th ed.) Citation

Harvey, J. H. (1961). The origin of the perpendicular style.

Chicago Style (17th ed.) Citation

Harvey, John H. The Origin of the Perpendicular Style. 1961.

MLA (9th ed.) Citation

Harvey, John H. The Origin of the Perpendicular Style. 1961.

Warning: These citations may not always be 100% accurate.