Riedel (J. G. F.): (1) De Sluik- en Kroesharige Rassen tusschen Selebes en Papua. (The Hague, 1886.)
—— (2) The Island of Flores or Pulan Bunga. The Tribes between Sika and Manggaraai. (Rev. col. int., tome ii. 1886.)
Rinn (Louis): Marabouts et Khouan. (Algiers, 1884.)
Roscoe (John): The Baganda. (London, 1911.)
Ross (Alexander): A Needful Caveat, or Admonition, for them who desire to know what Use may be made of, or if there be danger in Reading the Alcoran. (The Alcoran of Mahomet, translated out of Arabick into French, by Sieur de Ryer, .… and newly Englished, for the satisfaction of all that desire to look into the Turkish Vanities.) (London, 1688.)
Rouffaer (G. P.): Het tijdperk van godsdienstovergang (1400–1600) in den Maleischen Archipel. (Bijdr. t.d.t.l. en vlk., dl. 50.) (1899.)
Rubruck: The Journey of William of Rubruck to the Eastern Parts of the World, 1253–55, as narrated by himself. Translated … by William Woodville Rockhill. (Hakluyt Society. Second Series. No. iv.) (London, 1900.)
Rüppell (Eduard): Reise in Abyssinien. (Frankfurt am Main, 1838.)
Rycaut (Sir Paul): Histoire de l’état présent de l’empire ottoman, traduit de l’Anglais de Monsieur Ricaut, par M. Briot. (Amsterdam, 1672.)
Sachau (Eduard): Über den zweiten Chalifen Omar. Ein Charakterbild aus der ältesten Geschichte des Islams. (Sitzungsberichte der Königlichen Preussischen Akademie der Wissenschaften. Berlin, 1902.)