Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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