Gundrey, E. (1964). At your service: A consumer's guide to the service trades and professions. Penguin books inc.
استشهاد بنمط شيكاغوGundrey, Elizabeth. At Your Service: A Consumer's Guide to the Service Trades and Professions. USA: Penguin books inc, 1964.
MLA استشهادGundrey, Elizabeth. At Your Service: A Consumer's Guide to the Service Trades and Professions. Penguin books inc, 1964.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.