MLA

Gustavo Duque, Ken Watanabe, Gustavo Duque, and Ken Watanabe. Osteoporosis Research. Springer London, 2011.

APA

Gustavo Duque, K. Watanabe, Duque, G., & Watanabe, K. (2011). Osteoporosis Research. Springer London.

Chicago

Gustavo Duque, Ken Watanabe, Gustavo Duque, and Ken Watanabe. Osteoporosis Research. : Springer London, 2011.