Robert F Johnson, R. S. (1960). Cave deposits of phosphate rock in central Java, Indonesia. S.n.
Chicago Style (17th ed.) CitationRobert F Johnson, Rob Sukamto. Cave Deposits of Phosphate Rock in Central Java, Indonesia. S.n, 1960.
MLA (8th ed.) CitationRobert F Johnson, Rob Sukamto. Cave Deposits of Phosphate Rock in Central Java, Indonesia. S.n, 1960.
Warning: These citations may not always be 100% accurate.