APA (7th ed.) Citation

Heckel, P. (2006). The Carboniferous System. Use of the new official names for the subsystems, series, and stages. Universitat de Barcelona.

Chicago Style (17th ed.) Citation

Heckel, P.H. The Carboniferous System. Use of the New Official Names for the Subsystems, Series, and Stages. Universitat de Barcelona, 2006.

MLA (9th ed.) Citation

Heckel, P.H. The Carboniferous System. Use of the New Official Names for the Subsystems, Series, and Stages. Universitat de Barcelona, 2006.

Warning: These citations may not always be 100% accurate.