APA (7 वां संस्करण) प्रशस्ति पत्र

Heller, S. (2017). Retirement life insurance: How much is needed to optimize retirement spending. De Gruyter.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Heller, Steven. Retirement Life Insurance: How Much Is Needed to Optimize Retirement Spending. Boston, [Massachusetts] ; Heidelberg, [Germany]: De Gruyter, 2017.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Heller, Steven. Retirement Life Insurance: How Much Is Needed to Optimize Retirement Spending. De Gruyter, 2017.