Subtitles: 3.10Follow the same rules for titles for spelling, abbreviations, numbers, capitalization, and use of italics. NOTE: Only exception is for journal articles the subtitle begins with a lowercase letter.
Example:
Hallier J, Baralou E. Other voices, other rooms: differentiating social identity development in organisational and pro-am virtual teams. New Technology, Work & Employment. 2010;25(2):154-166. doi: 10.1111/j.1468-005X.2010.00245.x.