Holm Jakobsen, B. (1998) “K. H. Tan: Soil Sampling, Preparation, and Analysis. Books in Soil, Plants, and the Environment, 45. Dekker, New York 1996. xx, 408 s., ill, 24 cm. USD 100,-.”, Geografisk Tidsskrift, 98. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/42140 (Set: 3marts2021).