alphabetic alphabetic-verb authortitle authortitle-comp authortitle-ibid authortitle-icomp authortitle-tcomp authortitle-terse authortitle-ticomp authoryear authoryear-comp authoryear-ibid authoryear-icomp debug draft numeric numeric-comp numeric-verb reading standard verbose verbose-ibid verbose-inote verbose-note verbose-trad1 verbose-trad2 verbose-trad3