* {{cite book|ref=harv|last=Poeze|first=Harry A. |title=Di Negeri Penjajah: Orang Indonesia di Negeri Belanda, 1600-1950|year=2008|publisher=Kepustakaan Populer Gramedia|isbn=978-979-91-0749-7|date=|location=Jakarta|pages=181-183|url-status=live}}
* {{cite journal|first=Th.|last=Pigeaud|authorlink=Theodoor Gautier Thomas Pigeaud|title=In Memoriam Professor Poerbatjaraka|journal=[[Bijdragen tot de Taal-, Land- en Volkenkunde]]|volume=122|issue=4|date=1966|doi=10.1163/22134379-90002918|issn=0006-2294|location=Leiden|p=404–412|ref=harv|jstor=27860637}}
*{{cite journal|first=M. C.|last=Ricklefs|authorlink=M. C. Ricklefs|date=1985|title=In Memoriam Dr. H. J. de Graaf: 2 December 1899 — 24 August 1984|pages=191–201|jstor=27863672|publisher=Brill|journal= Bijdragen tot de Taal-, Land- en Volkenkunde|volume=141|issue=2/3|ref=harv}}
*{{cite paper|first=Dick|last=van der Meij|title=Prof. Dr. R.M. Ng. Purbatjaraka Tokoh Jawa Dalam Dunia Ilmu Pengetahuan Kesusastraan Jawa|url=http://perpumda-dki.pnri.go.id/?q=content/prof-dr-rm-ng-purbatjaraka-tokoh-jawa-dalam-dunia-ilmu-pengetahuan-kesusastraan-jawa|publisher=Perpustakaan Nasional Indonesia (The National Library of Indonesia)|language=id|date=2006|ref=harv}}
*{{cite book|ref=harv|last=Anderson|first=Benedict R. O'G |authorlink=Benedict Anderson|title=Language and Power: Exploring Political Cultures in Indonesia|url=https://books.google.com/books?id=05cZ6dxZYLcC|year=2006|publisher=Equinox Publishing|isbn=978-979-3780-40-5}}
*{{cite book|ref=harv|first=Daniel George Edward |last=Hall|title=Historians of South East Asia|url=https://books.google.com/books?id=zGsrAAAAIAAJ|year=1961|publisher=Oxford University Press}}
