APA (7th ed.) Citation

Porter, A., Wood, M., & Wood, T. (1991). Science companions Andrew Porter, Maria Wood and Trevor Wood. Stanley thornes.

Chicago Style (17th ed.) Citation

Porter, Andrew, Maria Wood, and T. Wood. Science Companions Andrew Porter, Maria Wood and Trevor Wood. Cheltenham: Stanley thornes, 1991.

MLA (9th ed.) Citation

Porter, Andrew, et al. Science Companions Andrew Porter, Maria Wood and Trevor Wood. Stanley thornes, 1991.

Warning: These citations may not always be 100% accurate.