The origins of navies in the Late Middle Ages.

von Unger, Richard W.
Veröffentlicht in Maritime warfare in Northern Europe. Technology, organisation, logistics and administration 500 BC-1500 AD. Papers from an International Research Seminar at the Danish National Museum, Copenhagen, 3-5 May 2000.
Copenhagen : The National Museum of Denmark, Copenhagen, 2002.
Umfang/Format: 287-291.

Beer in the Middle Ages and the Renaissance

von Unger, Richard W.
Philadelphia : University of Pennsylvania Press, 2004.
Umfang/Format: xvi, 319 p. : ill., tabl. ; 24 cm.

The ship in the medieval economy, 600 - 1600 :

von Unger, Richard W. 1942-
London : Croom Helm [u.a.], 1980.
Umfang/Format: 96-117, 201-298 pages : illustrations ; 30 cm

Nautical archaeology : progress and public responsibility

BAR international series ; 220
Oxford : B.A.R., 1984.
Umfang/Format: 219 p. : ill., maps, plans. ; 26 cm.

Cartography in antiquity and the Middle Ages : fresh perspectives, new methods

Technology and change in history ; v. 10
Boston : Brill, 2008.
Umfang/Format: xix, 299, 14 p. of plates : ill. ; 25 cm.