Kauffmann, C; Tébar Less, C; Teichmann, D (2012). Corporate Greenhouse Gas Emission Reporting: A Stocktaking of Government Schemes", OECD Working Papers on International Investment, 2012/01. OECD Publishing. p. 27. doi:10.1787/5k97g3x674lq-en.
NICA 2019, pp. 10–17 Michaelowa, Axel; Shishlov, Igor; Hoch, Stephan; Bofill, Patricio; et al. (2019). Overview and Comparison of Existing Carbon Crediting Cchemes(PDF) (Report). Helsinki: Nordic Initiative for Cooperative Approaches (NICA) and Perspectives Climate Group Gmbh. Retrieved 20 December 2022.
NICA 2019, pp. 24–29 Michaelowa, Axel; Shishlov, Igor; Hoch, Stephan; Bofill, Patricio; et al. (2019). Overview and Comparison of Existing Carbon Crediting Cchemes(PDF) (Report). Helsinki: Nordic Initiative for Cooperative Approaches (NICA) and Perspectives Climate Group Gmbh. Retrieved 20 December 2022.
Michaelowa, Axel; Shishlov, Igor; Hoch, Stephan; Bofill, Patricio; Espelage, Aglaja (2019). Overview and comparison of existing carbon crediting schemes(PDF). Helsinki: Nordic Initiative for Cooperative Approaches (NICA) and Perspectives Climate Group Gmbh. p. 28.
Michaelowa, Axel; Shishlov, Igor; Hoch, Stephan; Bofill, Patricio; Espelage, Aglaja (2019). Overview and comparison of existing carbon crediting schemes(PDF). Helsinki: Nordic Initiative for Cooperative Approaches (NICA) and Perspectives Climate Group Gmbh. pp. 25–26.