http://www.ncbi.nlm.nih.gov/

The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.

PubMed

http://www.ncbi.nlm.nih.gov/pubmed/

PubMed comprises more than 26 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

PubMed Central® (PMC)

http://www.ncbi.nlm.nih.gov/pmc/

https://www.ncbi.nlm.nih.gov/pmc/

Is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health’s National Library of Medicine (NIH/NLM).

An Online Forum As a Qualitative Research Method: Practical Issues:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2491331/

Despite positive aspects of online forums as a qualitative research method, very little is known about practical issues involved in using online forums for data collection, especially for a qualitative research project.

Early Puzzle Play: A predictor of preschoolers’ spatial transformation skill:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3289766/

Individual differences in spatial skill emerge prior to kindergarten entry. However, little is known about the early experiences that may contribute to these differences. The current study examines the relation between children’s early puzzle play and their spatial skill.