APA-čujuhus (7. p.)

Sommer, R. (1997). A practical guide to behavioral research: Tools and techniques (4th ed.). OUP.

Chicago-čujuhus (17. p.)

Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 4th ed. New York: OUP, 1997.

MLA-čujuhus (9. p.)

Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 4th ed. OUP, 1997.

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