Besides the database of the Czech Literature Portal you can find a database of Czech publications published abroad (until 2001) within the Czech National Bibliography, later published books are available in the National Library´s catalogue. You can also see the Index Translationum − World Bibliography of Translation (UNESCO).
Czech and Slovak Literature in English: A Bibliography by George J. Kovtun (Washington: Library of Congress, 1988).
Czech Literature in English Translation, MA thesis by Dana Soukupová (Brno: Masaryk University, 2006).
Encyclopedia of Literary Translation into English (vol. 1) edited by Olive Classe (Chicago: Fitzroy Dearborn Publishers, 2000, pp. 329−332).