Brian Crudge, Trang Nguyen, Tien Trung Cao: The challenges and conservation implications of bear bile farming in Viet Nam. In: Oryx. Juli 2018, ISSN0030-6053, S.1–8, doi:10.1017/S0030605317001752 (cambridge.org [abgerufen am 13. November 2018]).
Brian Crudge, Trang Nguyen, Tien Trung Cao: The challenges and conservation implications of bear bile farming in Viet Nam. In: Oryx. Juli 2018, ISSN0030-6053, S.1–8, doi:10.1017/S0030605317001752 (cambridge.org [abgerufen am 13. November 2018]).
Brian Crudge, Trang Nguyen, Tien Trung Cao: The challenges and conservation implications of bear bile farming in Viet Nam. In: Oryx. Juli 2018, ISSN0030-6053, S.1–8, doi:10.1017/S0030605317001752 (cambridge.org [abgerufen am 13. November 2018]).