APA Style
et.al, O, M, J. (2006).
The merck index : an encyclopedia of chemicals. drog and biologicals include cd .
USA:
MERCK AND CO. INC.
MLA Style
et.al, Oneil., Maryadcle, J.
"The merck index : an encyclopedia of chemicals. drog and biologicals include cd".
USA:
MERCK AND CO. INC,
2006.
CD-ROM.