Plum and Posner's Diagnosis and Treatment of Stupor and ComaJerome B. Posner, Clifford B. Saper, Nicholas D. Schiff, Jan Claassen · First published 2019Open the Tome
Cultureel kapitaal, etnische herkomst en onderwijsprestatiesGeert Driessen, Jan Doesborgh, Adrie Claassen · First published 1999Open the Tome
Environmental potential atlas for South AfricaThomas R. Van Viegen, Willem Van Riet, Paul Claassen, Lourens M. Du Plessis, Jan D. Janse van Rensburg · First published 1997Open the Tome
