OBIAKOR, Festus E.; UTLEY, Cheryl Anita Rose a ROTATORI, Anthony F. Effective education for learners with exceptionalities. Advances in special education. Amsterdam: JAI, 2003. ISBN 9781849501866. Dostupné také z: https://proxy.k.utb.cz/login?url=https://doi.org/10.1016/S0270-4013(2003)15.