This page has course materials related to human physical and cognitive development as it relates to psychology.
The easiest place to find articles by Erik Erikson is in JSTOR. In the search box, type "Erikson, Erik" and then choose "Author" from the drop down box, as shown below.
You can use the second box to type in an additional subject, such as "stages" or "trust," to narrow your search.
Most of the items in the list will be articles by Erik H. Erikson, but there are also reviews of his books by other authors. Double-check the author line to make sure.