Hansen, K. (1981) “W.K. Hamblin, J.D. Howard: , EXERCISES IN PHYSICAL GEOLOGY 5. ed. Minneapolis, Minn. 1980, VII, 225 s., ill., 28 cm, Instructor’s supplement IV, 68 s., ill. Paperback $ 9.95. Feffer and Simons Education Division, Sussex.”, Geografisk Tidsskrift, 81. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/45239 (Set: 11august2020).