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text & illustrations: Sieb Posthuma, Gecko Press, NEW ZEALAND, 2014
text & illustrations: Sieb Posthuma, Boje, Germany, 2008
text & illustrations: Sieb Posthuma, JAPAN, 2015
author: Annie M.G. Schmidt, translator: David Colmer, illustrations: Sieb Posthuma, Eerdmans Publishing Co, USA, 2000
Booktrailer
text & illustrations: Sieb Posthuma, Publishing House of Electronics Industry, CHINA, 2014
text & illustrations: Sieb Posthuma, Turbine, DENMARK, 2012
text & illustrations: Sieb Posthuma, Seemann E.A., GERMANY, 2015
text & illustrations: Sieb Posthuma, Editura 34, BRASIL, 2015
text & illustrations: Sieb Posthuma, © éditions Sarbacane, Paris, FRANCE, 2013
text & illustrations: Sieb Posthuma, White Star Kids, ITALY, 2016
text & illustrations: Sieb Posthuma, Gecko Press, NEW ZEALAND, 2014