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Weddell, Rodger A (август 2004). „Subcortical modulation of spatial attention including evidence that the Sprague effect extends to man”. Brain and Cognition. 55 (3): 497—506. PMID15223196. doi:10.1016/j.bandc.2004.02.075.CS1 одржавање: Формат датума (веза)
Wallace, Steven F.; Rosenquist, Alan C.; Sprague, James M. (1990). „Ibotenic acid lesions of the lateral substantia nigra restore visual orientation behavior in the hemianopic cat”. Journal of Comparative Neurology. 296 (2): 222—252. PMID2358533. doi:10.1002/cne.902960204.