http://repository.uhamka.ac.id/4004/
Titik Haryati, Dr. Titik Haryati, M.Pd
Titik Haryati, Dr. Titik Haryati, M.Pd NILAI KESMEN. Universitas Muhammadiyah Prof. Dr. Hamka. (Unpublished)
http://repository.uhamka.ac.id/4004/1/NILAI%20KESMEN%204A%2C%204B%2C%204C.pdf