Firefly Books. 2003: 75. ISBN 978-1-55297-772-9. Frank H.T. Rodes, Herbert S. Zim en Paul R. Shaffer (1993) - Natuurgids Fossielen (het ontstaan, prepareren
Invertebrate Fossils, Ch 6, Brachiopoda, R.C. Moore. Frank HT Rodes, Herbert S. Zim en Paul R. Shaffer (1993) - Natuurgids Fossielen (het ontstaan, prepareren
–通过eFloras.org. Virginia Tech Department of Forestry fact sheet on Black Oak Zim, Herbert S.; Martin, Alexander C. Trees: A Guide to Familiar American Trees. Golden