Rook, L., Bondioli, L., Köhler, M., Moyà-Solà, S., & Macchiarelli, R. (1999). Oreopithecus was a bipedal ape after all: Evidence from the iliac cancellous architecture. Proc Natl Acad Sci U S A.

Rook, Lorenzo, Luca Bondioli, Meike Köhler, Salvador Moyà-Solà, ja Roberto Macchiarelli. "Oreopithecus Was a Bipedal Ape After All: Evidence From the Iliac Cancellous Architecture." Proc Natl Acad Sci U S A 1999.

Rook, Lorenzo, et al. "Oreopithecus Was a Bipedal Ape After All: Evidence From the Iliac Cancellous Architecture." Proc Natl Acad Sci U S A 1999.