Cita APA (7a ed.)

Littke, R., Rullkötter, J., & Schaefer, R. G. (1991). Organic carbon geochemistry of ODP Leg 121 samples. PANGAEA.

Cita Chicago Style (17a ed.)

Littke, Ralf, Jürgen Rullkötter, y Rainer G. Schaefer. Organic Carbon Geochemistry of ODP Leg 121 Samples. PANGAEA, 1991.

Cita MLA (9a ed.)

Littke, Ralf, et al. Organic Carbon Geochemistry of ODP Leg 121 Samples. PANGAEA, 1991.