APA (7e ed.) Bronvermelding

Não informado. (2020). Progress Report of the Bulgarian National Committee for the International Biological Programme. Bulgarian National Committee for the International Biological Programme.

Chicago (17e ed.) Bronvermelding

Não informado. Progress Report of the Bulgarian National Committee for the International Biological Programme. Sofia: Bulgarian National Committee for the International Biological Programme, 2020.

MLA (8e ed.) Bronvermelding

Não informado. Progress Report of the Bulgarian National Committee for the International Biological Programme. Bulgarian National Committee for the International Biological Programme, 2020.

Let op: Deze citaties zijn niet altijd 100% accuraat.