1. Hendri, J., I. Ginting, and Laila A., 2008, Gamma radiation studies on the binding of acrylic acid grafted chitosan polyethylene. Proceeding of 2nd National Science and technology Seminar, Lampung University. 17-18 November 2008.
2. Julianti, E. and M. Nurminah. Properties of plastic and paper packaging and their influence to the foods. Agriculture Technology Department, Faculty of agriculture. North Sumatra University, 2012.
3. Phase morphology, thermomechanical, and crystallization behavior of uncompatibilized and PP-g-MAH compatibilized polypropylene/polystyrene blends
4. Blend of Polypropylene/Poly(lactic acid) for Medical Packaging Application: Physicochemical, Thermal, Mechanical, and Barrier Properties
5. Rasal, R. M., & Hirt, D. E. (2009). Improving the properties of poly lactic acid. Plastics Research online, ed by sop engineers, Clemson, SC.