Yopp JM, Deal AM, Nakamura ZM, Park EM, Edwards T, Wilson DR, Biesecker B, Rosenstein DL. Psychological and parental functioning of widowed fathers: the first two years. J Fam Psychol. 2019 Aug;33(5):565-74. doi: 10.1037/fam0000528
Phanikumar CV, Maitra B. Modeling willingness-to-pay values for rural bus attributes under different trip purposes. JTRF. 2006;45(2):31-44. doi: 10.22004/ag.econ.206787