Peter Forsskal: Thoughts on Civil Liberty
  Forsskål´s descriptions of the animal and plant species collected during the Arabian expedition were published and posthumously edited by Carsten Niebuhr as well as illustrations concerning them drawn by  G.W. Baurenfeind. They are available online via Biological Heritage Library; although other online resources are also available.
  Descriptiones Animalium: Avium, Amphibiorum, Piscium, Insectorum, Vermium, quae in itinere orientali observavit Petrus Forskål, post mortem edidit Carsten Niebuhr. Hauniae, 1775.
  Flora Aegyptiaco-Arabica sive descriptiones plantarum quas per Aegyptum inferiorem at Arabiam felicem detexit, illustravit Petrus Forskål,, post mortem edidit Carsten Niebuhr. Hauniae, 1775
  Icones rerum naturalium, quas in itinere orientali depingi curavit Petrus Forskål, post mortem auctoris edidit Carsten Niebuhr. Hauniae, 1776
  A new edition of Thorkild Hansen's 1962 book, Arabia Felix: the Danish Expedition 1761- 1767, was published by the New York Review of Books in 2017 - see The  introduction was written by Colin Thubron,   Lost in Asia - see
  The best account is L. J. Baack's Undying Curiosity: Carsten Niehbur and the Royal Danish Expedition to Arabia (1761 - 1767) - see