1. Market valuation of preconditioning feeder calves;Avent;J. Agric. Appl. Econ.,2004
2. Banton, C. 2020. Economic value. Investopedia. 〈https://www.investopedia.com/terms/e/economic-value.asp〉. Accessed [07 May 2021].
3. Organisational research: determining appropriate sample size in survey research;Bartlett;Inf. Technol., Learn. Perform. J.,2001
4. Social science research: principles, methods and practices;Bhattacherjee,2012