Ruaza, Fabio C., et al. “MORPHOLOGICAL POLYMORPHISM OF Canarium Urceus Urceus (Linnaues), 1758 (MOLLUSCA: GASTROPODA) IN MARINE AREAS OF CARAGA REGION, PHILIPPINES”. SDSSU MULTIDISCIPLINARY RESEARCH JOURNAL, vol. 3, Dec. 2015, pp. 89-94, doi:10.69546/r9v20486.