American Psychological Association 6th edition

Helpman, E., & Trajtenberg, M. [ca. 1994]. A Time to Sow and a Time to Reap : Growth Based on General Purpose Technologies. In NBER working paper series [Cd]. Cambridge, Mass.: National Bureau of Economic Research. https://doi.org/10.3386/w4854

ISO-690 (author-date, English)

HELPMAN, Elhanan und TRAJTENBERG, Manuel, 1994. A Time to Sow and a Time to Reap : Growth Based on General Purpose Technologies. Cambridge, Mass.: National Bureau of Economic Research.

Modern Language Association 9th edition

Helpman, E., und M. Trajtenberg. „A Time to Sow and a Time to Reap : Growth Based on General Purpose Technologies“. NBER working paper series, cd, National Bureau of Economic Research, 1994, https://doi.org/10.3386/w4854.

Mohr Siebeck - Recht (Deutsch - Österreich)

Helpman, Elhanan/Trajtenberg, Manuel: A Time to Sow and a Time to Reap : Growth Based on General Purpose Technologies, Cambridge, Mass. 1994.

Emerald - Harvard

Helpman, E. und Trajtenberg, M. (1994), A Time to Sow and a Time to Reap : Growth Based on General Purpose Technologies, NBER working paper series, Bd. , National Bureau of Economic Research, Cambridge, Mass., verfügbar unter:https://doi.org/10.3386/w4854.

Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.