Cita APA (7th ed.)

Anderson, R. D. (1960). Concepts of informal geometry (Prelim. ed.). SMSG.

Cita Chicago (17th ed.)

Anderson, Richard D. Concepts of Informal Geometry. Prelim. ed. [New Haven]: SMSG, 1960.

Cita MLA (9th ed.)

Anderson, Richard D. Concepts of Informal Geometry. Prelim. ed. SMSG, 1960.