Cita APA (7th ed.)

Popham, W. J., & Baker, E. L. (1970). Systematic instruction. Prentice-Hall.

Cita Chicago (17th ed.)

Popham, W. James, i Eva L. Baker. Systematic Instruction. Englewood Cliffs, N.J.: Prentice-Hall, 1970.

Cita MLA (8th ed.)

Popham, W. James, i Eva L. Baker. Systematic Instruction. Prentice-Hall, 1970.