APA Style

Walker, Richard. (2003). Genes & DNA . Boston: Kingfisher Knowledge.

Chicago Style

Walker, Richard. Genes & DNA. Boston: Kingfisher Knowledge, 2003. Text.

MLA Style

Walker, Richard. Genes & DNA. Boston: Kingfisher Knowledge, 2003. Text.

Turabian Style

Walker, Richard. Genes & DNA. Boston: Kingfisher Knowledge, 2003. Print.