The Custom format option on the Bibliography and Generate Citations dialogs lets you write information from your datafile in formats other than those provided as compiled Standard Publishing Style Formats.
Citation installs several custom format files you can use to print your records, or use as templates for writing your own custom format files. These files are located in your citation folder, in a subfolder called "CustomFormats". Citation custom format files have the extension *.cf.
To write a bibliography or reference list using a custom format