Use arabic numerals for volume numbers if the work cited includes more than 1 volume, even if the publisher used roman numerals.If the volumes have no separate titles, merely numbers, the number should be given after the general title. 1. US Department of Health and Human Services. Understanding and Improving Health and Objectives for Improving Health. Vol 1. 2nd ed. Washington, DC: US Dept of Health and Human Services; 2000.If the volumes have separate titles, the title of the volume referred to should be given first, with the title of the overall series of which the volume is a part ...
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