International Labour Office. (1969). Introduction to work study/2e (2nd ed.). International Labour Office.
استشهاد بنمط شيكاغوInternational Labour Office. Introduction to Work Study/2e. 2nd ed. Geneva: International Labour Office, 1969.
MLA استشهادInternational Labour Office. Introduction to Work Study/2e. 2nd ed. International Labour Office, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.