Ghiselli, Edwin E.; Siegel, Jacob P. (December 1, 1972). "Leadership and Managerial Success in Tall and Flat Organization Structures". Personnel Psychology. 25 (4): 617. doi:10.1111/j.1744-6570.1972.tb02304.x.
Ghiselli, Edwin E.; Siegel, Jacob P. (December 1, 1972). "Leadership and Managerial Success in Tall and Flat Organization Structures". Personnel Psychology. 25 (4): 618. doi:10.1111/j.1744-6570.1972.tb02304.x.