APA

Brown K. S., Sheppard P. M. & Turner J. R. G.Quaternary in tropical America: evidence from race formation in Heliconius butterflies. : .

Chicago

Brown Keith S, Sheppard P M and Turner John R G.Quaternary in tropical America: evidence from race formation in Heliconius butterflies. : .

Harvard

Brown K. S., Sheppard P. M. and Turner J. R. G.Quaternary in tropical America: evidence from race formation in Heliconius butterflies. : .

MLA

Brown Keith S, Sheppard P M and Turner John R G.: . .