Kusnadi, A., and T. Prawisuda. “Rancang Bangun Plugin WordPress Penghitung Kepadatan Kata Kunci”. Ultima InfoSys : Jurnal Ilmu Sistem Informasi, Vol. 7, no. 2, Dec. 2016, pp. 94-99, doi:https://doi.org/10.31937/si.v7i2.546.