Casriatun, C., P. Hardati, and E. Banowati. “Learning Strategy for Market Main Discussion Based Outdoor Learning in Increasing Conceptual Understanding of Social Studies”. JESS (Journal of Educational Social Studies), Vol. 8, no. 1, Aug. 2019, pp. 85-91, https://journal.unnes.ac.id/sju/jess/article/view/32792.