Saptono, Laurentius, et al. “The Influence of Financial Quantitative Literacy and Subjective Numeracy on Impulsive Consumption With Materialism As the Mediator Variable”. Indian Journal of Marketing, vol. 49, no. 10, Oct. 2019, pp. 23-41, doi:10.17010/ijom/2019/v49/i10/147563.