Nuttall, C. P.; Leong, K. M. (1972). Occurrence of Acteonella (opisthobranch gastropod) in the Cretaceous of Sabah. Malaysia Geological Survey Geological Papers. 1: 1-9, pl. 1.
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Nuttall, C. P.; Leong, K. M.
1972
Occurrence of <i>Acteonella</i> (opisthobranch gastropod) in the Cretaceous of Sabah