*Quantities of twenty or fewer are spelled out as words, larger amount as digits. Exceptions are for ages, and perhaps others.
*Date format is day month year — 18 August 1957
*Months are to be spelled out in the body of the article as well as in footnotes and endnotes
*Calendar designation shall be either "BC" or "AD" whenever there may be ambiguity — AD 1957 or 3400 BC, but 2 January 201 AD
*Acronyms composed of initials shall omit periods — thus USA, FAS, PhD