Gw mau tau Klasifikasi berdasarkan USDA dari Tekstur tanah

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Marshall TJ (1947) "Mechanical composition of soil in relation to field descriptions of texture." Council for Scientific and Industrial Research, Bulletin No. 224, Melbourne.

Prescott JA, Taylor JK, Marshall TJ (1934) "The relationship between the mechanical composition of the soil and the estimate of texture in the field." Transactions of the First Commission of the International Society of Soil Science 1, 143–153.

Rowell D (1994) Soil Science; Methods and Application, Longman Scientific & Technical (1994), 350 pages

Toogood JA (1958) "A simplified textural classification diagram." Canadian Journal of Soil Science 38, 54–55.

Whitney M (1911) "The use of soils east of the Great Plains region." United States Department of Agriculture Bureau of Soils Bulletin No. 78.