Lua APA (7ú heag.)

Crain, W. C. (1992). Theories of developemnt: Concepts and applications (3rd ed.). Prentice-Hall.

Lua i Stíl Chicago (17ú heag.)

Crain, William C. Theories of Developemnt: Concepts and Applications. 3rd ed. Englewood Cliffs, New Jersey: Prentice-Hall, 1992.

Lua MLA (9ú heag.)

Crain, William C. Theories of Developemnt: Concepts and Applications. 3rd ed. Prentice-Hall, 1992.

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