Use Purdue Owl to cite your sources automatically in APA style.
CELLS alive! represents 30 years of capturing film and computer-enhanced images of living cells and organisms for education and medical research. The site has been available continuously and updated annually since May of 1994 and now hosts over 4 million visitors a year.
For over 100 years, the American Cancer Society has worked relentlessly to save lives and create a world with less cancer.
NCI is the nation's leader in cancer research.
The DNA Learning Center is the source for timely information about genes in your life.
Discover more about DNA, genes, and genomes, and the implications for our health and society.
Explore wildlife guides from the National Wildlife Federation to get to know some of the incredible fauna and flora found throughout the United States. The National Wildlife Federation, America's oldest (since 1936) and largest conservation organization, works across the country to unite Americans from all walks of life in giving wildlife a voice.
The official site of National Geographic. Supporting Exploration, Education, and Conservation Since 1888.