Cita APA (7th ed.)

Selvidge, R. W., & Fryklund, V. C. (1946). Principles of trade and industrial teaching (2nd ed.). Bennett.

Cita Chicago (17th ed.)

Selvidge, Robert Washington, i Verne Charles Fryklund. Principles of Trade and Industrial Teaching. 2nd ed. Peoria, Ill.: Bennett, 1946.

Cita MLA (8th ed.)

Selvidge, Robert Washington, i Verne Charles Fryklund. Principles of Trade and Industrial Teaching. 2nd ed. Bennett, 1946.