Hartono, H. M. S. (1969). Globigerina marls and their planktonic foraminifera from the Eocene of Nanggulan, Central Java. Contributions from the Cushman Foundation for Foraminiferal Research. 20(4): 152-159.
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Hartono, H. M. S. (1969). Globigerina marls and their planktonic foraminifera from the Eocene of Nanggulan, Central Java. Contributions from the Cushman Foundation for Foraminiferal Research. 20(4): 152-159