APA-referens

BURTON, M., & BuRTON, R. Wild life encyclopedia ( in 20 volumes). Marshall cavendish corporation.

Chicago-stil citat

BURTON, Maurice, och Robert BuRTON. Wild Life Encyclopedia ( in 20 Volumes). New York: Marshall cavendish corporation.

MLA-referens

BURTON, Maurice, och Robert BuRTON. Wild Life Encyclopedia ( in 20 Volumes). Marshall cavendish corporation.