«Biocyclic-Vegan Standards. Version 1.02». BNS Biocyclic Network Services Ltd. 9 de octubre de 2017. «Only in case that the prophylactic and holistic measures taken have not been able to prevent the development of a situation critical to the crop (disease) and self-produced preparations are either not available or did not achieve a satisfactory result, the use of certain crop-treatment products as they are mentioned in the Green List can be permitted.»
Hayek, Matthew N; Garrett, Rachael D (25 de julio de 2018). «Nationwide shift to grass-fed beef requires larger cattle population». Environmental Research Letters(en inglés)13 (8): 084005. ISSN1748-9326. doi:10.1088/1748-9326/aad401.
Hayek, Matthew N; Garrett, Rachael D (25 de julio de 2018). «Nationwide shift to grass-fed beef requires larger cattle population». Environmental Research Letters(en inglés)13 (8): 084005. ISSN1748-9326. doi:10.1088/1748-9326/aad401.