Lewis, Chance W.; Dugan, James J.; Winokur, Marc A.; Cobb, R. Brian (December 2005). "The Effects of Block Scheduling on High School Academic Achievement". NASSP Bulletin. 98 (645): 72–87. doi:10.1177/019263650508964506. S2CID59575924.
Lewis, Chance W.; Dugan, James J.; Winokur, Marc A.; Cobb, R. Brian (December 2005). "The Effects of Block Scheduling on High School Academic Achievement". NASSP Bulletin. 98 (645): 72–87. doi:10.1177/019263650508964506. S2CID59575924.