Cita APA (7th ed.)

Frerichs, H., & Gras, B. (2001). Coplanare PCB in Hamburger Böden.

Cita Chicago (17th ed.)

Frerichs, Heike, i Birgit Gras. Coplanare PCB in Hamburger Böden. Hamburg, 2001.

Cita MLA (8th ed.)

Frerichs, Heike, i Birgit Gras. Coplanare PCB in Hamburger Böden. 2001.