APA (7th ed.) Citation

Kotlikoff, L. J. (1998). The A-K model -- its past, present and future. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Kotlikoff, Laurence J. The A-K Model -- Its Past, Present and Future. Cambridge: National Bureau of Economic Research, 1998.

MLA (9th ed.) Citation

Kotlikoff, Laurence J. The A-K Model -- Its Past, Present and Future. National Bureau of Economic Research, 1998.