1. Beichl G., (1986), Unit basis – a neglected problem-solving technique, J. Chem. Educ. , 63 , 146–147
2. California High School Exit Examination (CAHSEE Results), https://www.cde.ca.gov/nr/ne/yr13/yr13rel78atta.asp date accessed 1/31/18
3. Chandrasegaran A. L., Treagust D. F., Waldrip B. G. and Chandrasegaran A., (2009), Students’ dilemmas in reaction stoichiometry problem solving: deducing the limiting reagent in chemical reactions, Chem. Educ. Res. Pract. , 10 , 14–23
4. Cook E. and Cook R., (2005), Cross-proportions: a conceptual method of developing quantitative problem-solving skills, J. Chem. Educ. , 82 , 1187–1189
5. DeToma R., (1994), Symbolic algebra and stoichiometry, J. Chem. Educ. , 71 , 568–570