APA (7th ed.) Citation

Porter, A., Wood, M., & Wood, T. (1991). Science companions / Andrew Porter. Stanley Thornes.

Chicago Style (17th ed.) Citation

Porter, Andrew, Maria Wood, and T. Wood. Science Companions / Andrew Porter. Leckhampton: Stanley Thornes, 1991.

MLA (9th ed.) Citation

Porter, Andrew, et al. Science Companions / Andrew Porter. Stanley Thornes, 1991.

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