Sources list for AMERICAN SCIENTIST CONTRIBUTION:

Garber, Kat. "The Contribution of Turkish, Greek and Italian Immigrants and their respective cultures on the United States." http://facweb.furman.edu/~jpitts/14r-co ntribution%20of%20culture%20on%20US.htm Garber, Kat. "The Contribution of Turkish, Greek and Italian Immigrants and their respective cultures on the United States." http://facweb.furman.edu/~jpitts/14r-co ntribution%20of%20culture%20on%20US.htm
The Greek-American Community

"Pay schemes - Contribution Pay." Employers Organisation for Local Government. 1 February 2006. [7]http://www.lg-employers.gov.uk /rewards/schemes/performance.html "Pay schemes - Contribution Pay." Employers Organisation for Local Government. 1 February 2006. [7]http://www.lg-employers.gov.uk /rewards/schemes/performance.html
Contribution Pay

Spector, P.E., & O'Connell, B.J. (1994). The contribution of personality traits, negative affectivity, locus of control, and type A to the subsequent reports of job stressors and job strains. Journal of Occupational and Organizational Psychology, 67, 1-12
Social Workers and Burnout

Kliman, A. "A Contribution to the Ongoing Inquiry into the Existence of Marx's Marxism" Submitted for discussion to the International Working Group in Value Theory. Miniconference at the Eastern Economic Association Conference. Washington, D.C., 1997.
Theory of Exploitation

Peimani, Hooman. 2003. Falling Terrorism and Rising Conflicts : The Afghan "Contribution" to Polarization and Confrontation in West and South Asia / . Westport, CT: Praeger.
Terrorism