1. ASTM D 2607-69 (1990). "Classification of peats mosses humus and related products". Annual Book of ASTM Standards Philadelphia USA.
2. ASTM D 2974 (2000). "Standard test method for moisture ash and organic matter of peat and other organic soils". Book of ASTM Standards Philadelphia USA.
3. ASTM D1997-91 (1996). "Standard test method for laboratory determination of the fiber content of peat samples by dry mass". Annual Book of ASTM Standards Philadelphia USA.
4. BS 1377 Part 1-4 (1990). "Soils for civil engineering purposes". British Standards Institution. London. UK.