Philippine Council for Agricultural Resources Research & Seminar-Workshop on On-metallic Mineral Resources Development (1st : Laguna : 1978). (1979). [Proceedings of a] seminar-workshop on Non-metallic mineral resources development, Nayong Kalikasan, Caliraya, Laguna, Nov. 8-9, 1978. s.n.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Philippine Council for Agricultural Resources Research và Seminar-Workshop on On-metallic Mineral Resources Development (1st : Laguna : 1978). [Proceedings of a] Seminar-workshop on Non-metallic Mineral Resources Development, Nayong Kalikasan, Caliraya, Laguna, Nov. 8-9, 1978. [S.l: s.n, 1979.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Philippine Council for Agricultural Resources Research và Seminar-Workshop on On-metallic Mineral Resources Development (1st : Laguna : 1978). [Proceedings of a] Seminar-workshop on Non-metallic Mineral Resources Development, Nayong Kalikasan, Caliraya, Laguna, Nov. 8-9, 1978. s.n, 1979.