Veríssimo, D. ., Campbell, H. ., Tollington, S. ., MacMillan, D. ., & Smith, R. . Why do people donate to conservation? Insights from a ’real world’ campaign. PloS One, 13(1), e0191888. https://doi.org/10.1371/journal.pone.0191888 (Original work published 2018)