Vernon, P. E. (1971). Certificate of secondary education: Introduction to objective type examination.
استشهاد بنمط شيكاغوVernon, Philip E. Certificate of Secondary Education: Introduction to Objective Type Examination. 1971.
MLA استشهادVernon, Philip E. Certificate of Secondary Education: Introduction to Objective Type Examination. 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.