APA (7th ed.) Citation

SpringerLink (Online service), Walker, J. M., & Gaastra, W. (1987). Techniques in molecular biology. Croom Helm.

Chicago Style (17th ed.) Citation

SpringerLink (Online service), John M. Walker, and Wim Gaastra. Techniques in Molecular Biology. London: Croom Helm, 1987.

MLA (9th ed.) Citation

SpringerLink (Online service), et al. Techniques in Molecular Biology. Croom Helm, 1987.