Ajayi, N. A., Picache, U. G., & Santiago, L. S. (1983). The effect of the imposition of fines for overdue books on third and fourth year students of some selected high schools in Manila.

Ajayi, Nathaniel Akinola, Ursula G. Picache, and Ligaya S. Santiago. The Effect of the Imposition of Fines for Overdue Books on Third and Fourth Year Students of Some Selected High Schools in Manila. Quezon City : Institute of Library Science, University of the Philippines Diliman, 1983.

Ajayi, Nathaniel Akinola, et al. The Effect of the Imposition of Fines for Overdue Books on Third and Fourth Year Students of Some Selected High Schools in Manila. 1983.