APA (7 वां संस्करण) प्रशस्ति पत्र

Aker, H. F., Nelson, D. L., & Aker, V. N. (1936). Yesterday: The foundation of today. Harr Wagner Pub. Co..

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Aker, Homer Ferris, D. Lloyd Nelson, और Vanza Nielsen Aker. Yesterday: The Foundation of Today. San Francisco: Harr Wagner Pub. Co., 1936.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Aker, Homer Ferris, et al. Yesterday: The Foundation of Today. Harr Wagner Pub. Co., 1936.