Bourne, P. E. (2012). Seven Years; It's Time for a Change. Public Library of Science.
استشهاد بنمط شيكاغوBourne, Philip E. Seven Years; It's Time for a Change. Public Library of Science, 2012.
MLA استشهادBourne, Philip E. Seven Years; It's Time for a Change. Public Library of Science, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.