Cita APA (7a ed.)

Koekoek, R. (1969). The structure of papain: An X-ray diffraction study at 2.8Å resolution. V.R.B.-Offsetdrukkerij.

Cita Chicago Style (17a ed.)

Koekoek, Roelof. The Structure of Papain: An X-ray Diffraction Study at 2.8Å Resolution. Groningen: V.R.B.-Offsetdrukkerij, 1969.

Cita MLA (8a ed.)

Koekoek, Roelof. The Structure of Papain: An X-ray Diffraction Study at 2.8Å Resolution. V.R.B.-Offsetdrukkerij, 1969.