Gaya APA

Welker, H, R, K, D, G, H. (2003). Viral Infections and Treatment . New york: Marcel Dekker Inc.

Gaya MLA

Welker, Helga, Rubsamen-Waigmann,, Karl, Deres,, Guy, Hewlett,Reinhold. "Viral Infections and Treatment". New york: Marcel Dekker Inc, 2003. Text.