APA (7th ed.) Citation

Helpman, E., & Trajtenberg, M. (1994). A time to sow and a time to reap: Growth based on general purpose technologies.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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