(1981). Seminar Ilmiah Dermaga Tanjung Perak Surabaya 7-9 September 1981. FT-UAJY.
Chicagoスタイル(17版)引用形式Seminar Ilmiah Dermaga Tanjung Perak Surabaya 7-9 September 1981. FT-UAJY, 1981.
MLA(8版)引用形式Seminar Ilmiah Dermaga Tanjung Perak Surabaya 7-9 September 1981. FT-UAJY, 1981.
警告: この引用は必ずしも正確ではありません.