1. 1964. Dielectrics. London: Chapman and Hall LTD.
2. 2000. SMART, SAINT, SADABS, XPREP and SHELXTL/NT. Madison, WI: Smart Apex Software Reference Manuals. Bruker AXS Inc.
3. 1963. The crystal data determinative tables, second edition. American Crystallographic Association, Washington, DC, p 790-791.
4. Indexing in single-crystal diffractometry with an obstinate list of reflections
5. 1980. Social wasps. East Grinstead, UK: The Rentokil Library, Rentokil Ltd.