APA

Rens W., Grützner F., O'brien P. C. M., Fairclough H., Graves J. A. M. & Ferguson-Smith M. A. (20041227). Resolution and evolution of the duck-billed platypus karyotype with an X1Y1X2Y2X3Y3X4Y4X5Y5 male sex chromosome constitution. : Proceedings of the National Academy of Sciences of the United States of America.

Chicago

Rens Willem, Grützner Frank, O'brien Patricia C M, Fairclough Helen, Graves Jennifer A M and Ferguson-Smith Malcolm A. 20041227. Resolution and evolution of the duck-billed platypus karyotype with an X1Y1X2Y2X3Y3X4Y4X5Y5 male sex chromosome constitution. : Proceedings of the National Academy of Sciences of the United States of America.

Harvard

Rens W., Grützner F., O'brien P. C. M., Fairclough H., Graves J. A. M. and Ferguson-Smith M. A. (20041227). Resolution and evolution of the duck-billed platypus karyotype with an X1Y1X2Y2X3Y3X4Y4X5Y5 male sex chromosome constitution. : Proceedings of the National Academy of Sciences of the United States of America.

MLA

Rens Willem, Grützner Frank, O'brien Patricia C M, Fairclough Helen, Graves Jennifer A M and Ferguson-Smith Malcolm A. Resolution and evolution of the duck-billed platypus karyotype with an X1Y1X2Y2X3Y3X4Y4X5Y5 male sex chromosome constitution. : Proceedings of the National Academy of Sciences of the United States of America. 20041227.