Goodreads WWW home page, Aug. 16, 2010 (Jacek Pałkiewicz; b. June 02, 1942, Immensen, Germany)
Jacek Pałkiewicz WWW home page, Aug. 16, 2010 (Jacek Pałkiewicz; Ph.D.; Fellow of the Royal Geographical Society; member of International Academy for Information, Moscow, Russia)
OCLC, Aug. 16, 2010 (hdg: Pałkiewicz, Jacek; Pałkiewicz, Jacek Edward; usage: Jacek Pałkiewicz; Jacek E. Palkiewicz)