Krockover, G. H. (1977). Developing Earth Science Modules For The Secondary School. Journal of geological education, 25(4), 115-117. https://doi.org/10.5408/0022-1368-25.4.115
Citácia podle Chicago (17th ed.)Krockover, Gerald H. "Developing Earth Science Modules For The Secondary School." Journal of Geological Education 25, no. 4 (1977): 115-117. https://doi.org/10.5408/0022-1368-25.4.115.
Citácia podľa MLA (8th ed.)Krockover, Gerald H. "Developing Earth Science Modules For The Secondary School." Journal of Geological Education, vol. 25, no. 4, 1977, pp. 115-117, https://doi.org/10.5408/0022-1368-25.4.115.
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