Volker, Craig Alan (2025) Papua New Guinea English and Tok Pisin. In: Bolton, Kingsley, (ed.) The Wiley Blackwell Encyclopedia of World Englishes. John Wiley & Sons, Ltd., pp. 1-9.

Maitz, Péter, and Volker, Craig Alan (2017) Documenting unserdeutsch: reversing colonial amnesia. Journal of Pidgin and Creole Languages, 32 (2). pp. 365-397.

Volker, Craig Alan (2017) The legacy of the German language in Papua New Guinea. In: Klaus, Mühlhahn, (ed.) The Cultural Legacy of German Colonial Rule. De Gruyter, Berlin, Germany, pp. 167-191.