“Evaluation of the Effect of Red Guava (Psidium Guajava) Fruit Extract on Tyrosinase (EC 1.14.18.1) Activity by Spectrophotometry”. International Current Pharmaceutical Journal, vol. 1, no. 5, Apr. 2012, pp. 92-97, https://doi.org/10.3329/icpj.v1i5.10280.