D Widjanarko, - and Ratna Dewi Kusumaningtyas,, FT Teknik Kimia and I P Jamari, - (2020) Effect of Ceiba pentandra Biodiesel/ Dexlite Diesel Blends on the Four-Stroke Diesel Engine Performances. In: The 6th International Conference on Industrial Mechanical, Electrical and Chemical Engineering - ICIMECE 2020, 20 Oktober 2020, UNS Surakarta.

Ratna Dewi Kusumaningtyas,, FT Teknik Kimia and Haifah, - and D Widjanarko, - and H Prasetiawan, - (2020) Experimental and Kinetic Study of Free Fatty Acid Esterification Derived from Ceiba pentandra Seed Oil with Ethanol. In: The 7th International Conference on Mathematics, Science, and Education 2020 (ICMSE 2020], 6 Oktober 2020, Unnes Semarang.

D Widjanarko, - and M Khumaedi, - and Ratna Dewi Kusumaningtyas,, FT Teknik Kimia (2019) Continuous and Integrated Model of Learning Media and Evaluation for Vocational Education Application: A Case in Automotive Biodiesel Learning Material. In: The 5th International Conference on Technology and Vocational Teachers (ICTVT 2019), 14 - 15 September 2019, UNY.