Some reflections on the faurnal remains of the Roman castellum Valkenburg, excavation 1962. - Waterbolk, H.T; Bottema, S (Biologisch-archaeologisch Instituut Rijksuniversiteit Groningen, 1975)
Watebolk, H.T.: Evidence of cattle stalling in excavated pre-and protohistoric houses ; Bottema, S.: The use of gastroliths in archaeology