There are material and non-material ways to show your appreciation, and my preference lays to non- material, because it is the way that promotes equality and fair play. There is a whole variety of non-material ways such as e-mails with positive and congratulatory wording, e-cards, public singling them out on FB and other social networks, etc. One of the best ways of showing respect for your PSAs and CSAs is sharing with them your tips and ideas for success.