School Psychology PsyD Writing Samples - Secondary Sources??

[Dms22]

Hello! I am applying to school psychology PsyD programs and one of them asks for a sample term paper and sample lab paper. For these papers, I wrote them for undergraduate psychology classes. They have secondary sources though in them (even though secondary sources do not look too hot) because my professors said that for the purpose of the class we could use secondary sources (Even though you really aren't supposed to). 

Do you think I should try to find the articles, read them, and edit my papers so that they won't be secondary sources anymore, or can I just leave the secondary sources in them? It just seems like a daunting task because some of the secondary sources are really really old (like from the 80s-90s). 

Thanks for the help!!!!!!!