Cita APA (7th ed.)

Vockell, E. L., & Asher, J. W. (1995). Educational research (2nd ed.). Merrill.

Cita Chicago (17th ed.)

Vockell, Edward L., i J. William Asher. Educational Research. 2nd ed. Englewood Cliffs, N.J: Merrill, 1995.

Cita MLA (9th ed.)

Vockell, Edward L., i J. William Asher. Educational Research. 2nd ed. Merrill, 1995.