Cita APA (7th ed.)

Johnson, R. A. (1929). Modern geometry: An elementary treatise on the geometry of the triangle and the circle. Houghton Mifflin.

Cita Chicago (17th ed.)

Johnson, Roger A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston: Houghton Mifflin, 1929.

Cita MLA (9th ed.)

Johnson, Roger A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Houghton Mifflin, 1929.