James J. Heckman, Robert L. Nelson, Lee Cabatingan, USA) Heckman, James J. (University of Chicago, USA) Nelson, Robert L. (Northwestern University, USA) Cabatingan, Lee (American Bar Foundation
James J. Heckman, Robert L. Nelson, Lee Cabatingan, USA) Heckman, James J. (University of Chicago, USA) Nelson, Robert L. (Northwestern University, USA) Cabatingan, Lee (American Bar Foundation
James J. Heckman, Edward Leamer, Ireland) Heckman, James J. (University of Chicago, IL, U.S.A.; University College Dublin, USA) Leamer, Edward (University of California, Los Angeles, CA, James J Heckman
James J. Heckman, Edward Leamer, Ireland) Heckman, James J. (University of Chicago, IL, U.S.A.; University College Dublin, USA) Leamer, Edward (University of California, Los Angeles, CA, Edward E. Leamer