1. 16. Abbas, E,W., Rusmaniah, R., Mutiani, M., Putra,
M,A,H., Jumriani. (2022). Integration of River Tourism Content in Social
Studies Teaching Materials as an Efforts to Strengthen Student
Understanding. The Innovation of Social Studies Journal, Vol. 4, (1),
September 2022: 11-33. DOI:
https://doi.org/10.20527/iis
2. 17. Barchok, K. H. & Abura, O. G. (2013). Effect
of discovery method on secondary school student’s achivement in physics
in Kenya, Asian journal of social science & humanities.2 (3),
351-359.
3. 18. Calogiuri, G., Chroni, S. (2014). The impact of
the natural environment on the promotion of active living: An
integrative systematic review. BMC Public Health 14, 873.
https://doi.org/10.1186/1471-2458-14-873.
4. 19. Erdogan, M . (2015). he effect of summer
environmental education program (SEEP) on elementary school students’
environmental literacy. International Journal of Environmental &
Science Education, 2015, 10(2), 165-181. DOI:
10.12973/ijese.2015.238a
5. 20. Fidan,N,k . (2016). Sensitivity of Students to
the Natural Environment, Animals, Social Problems and Cultural Heritage.
International Electronic Journal of Elementary Education, 2016, 8(3),
403-424.
https://files.eric.ed.gov/fulltext/EJ1096594.pdf