Wujdi, A., M. Agustina, and I. Jatmiko. “Otolith Shape Indices of Skipjack Tuna, Katsuwonus Pelamis (Linnaeus, 1758) from the Indian Ocean”. Jurnal Iktiologi Indonesia, Vol. 18, no. 2, June 2018, pp. 151-63, doi:10.32491/jii.v18i2.312.