(1973). Individual Contributions: A preliminary survey. [Washington, D.C.]: National Academy of Engineering.
Παραπομπή Chicago StyleIndividual Contributions: A Preliminary Survey. [Washington, D.C.]: National Academy of Engineering, 1973.
Παραπομπή MLAIndividual Contributions: A Preliminary Survey. [Washington, D.C.]: National Academy of Engineering, 1973.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.