Samsell B, Lothman K, Samsell EE, Ideishi RI. Parents' experiences of caring for a child with autism spectrum disorder in the United States: a systematic review and metasynthesis of qualitative evidence. Fam Syst Health. 2022 Mar;40(1):93-104. doi: 10.1037/fsh0000654
Phanikumar CV, Maitra B. Willingness-to-pay and preference heterogeneity for rural bus attributes. J Transp Eng A-Syst. 2007 Jan;133(1).