1. Hãng Scilab - Hàn Quốc

https://drive.google.com/file/d/16GaHoOx9f_meA_wEMsMTgatbumL1DRle/view?usp=sharing

2. HÃNG LOVIBOND - ĐỨC

http://WWW.Lovibond.com/file-download/f23958_en

https://www.slideshare.net/ekokiswantoslide/mixing-art