Potential of chitosan from whiteleg shrimp (Litopenaeus vannamei) shell as antibacterial against Staphylococcus epidermidis, Pseudomonas aeruginosa, Propionibacterium acnes, and Escherichia coli using paper disc diffusion method - Suherman, S; Latif, M; Rosmala Dewi, S T (Media Farm, 2018)