(1974). Science Year: The world book science annual 1975. Chicago, Illinois: Field Enterprises Educational Corporation.
استشهاد بنمط شيكاغوScience Year: The World Book Science Annual 1975. Chicago, Illinois: Field Enterprises Educational Corporation, 1974.
MLA استشهادScience Year: The World Book Science Annual 1975. Chicago, Illinois: Field Enterprises Educational Corporation, 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.