• An analysis of engineering students' knowledge on the topic of occupational health and safety [Electronic resource]Paju, Jana; Kalle, Sigrid6th International Conference Biosystems Engineering 2015 : 7-8 May 2015, Tartu, Estonia : book of abstracts2015 / p. 113. [CD-ROM] http://bse.emu.ee/BSE2015_Book%20of%20ABSTRACTS_ISBN.pdf
• An analysis of engineering students' knowledge on the topic of occupational health and safetyPaju, Jana; Kalle, SigridAgronomy research2015 / p. 810-819 : ill http://agronomy.emu.ee/vol133/13_3_19_B5.pdf https://www.scopus.com/sourceid/21100201050 https://www.scopus.com/record/display.uri?eid=2-s2.0-84937138052&origin=inward&txGid=6902fadef39bca6570df9bb6326a5198