Cita APA (7th ed.)

Barker, D. S. (1983). Igneous rocks. Prentice-Hall.

Cita Chicago (17th ed.)

Barker, Daniel S. Igneous Rocks. New Jersey: Prentice-Hall, 1983.

Cita MLA (9th ed.)

Barker, Daniel S. Igneous Rocks. Prentice-Hall, 1983.