Hi, it really depends on the physiological mechanism you're interested in :
_ growth : auxin, cytokins, gibberelins
_plant defense : salicylic acid, jasmonates and ethylene
_organ determination : auxin and cytokins
_drought resistance : absissic acid
_fruit maturation : ethylene
...
Actually, phytohormones are well known, since the 60'. You will probably find informations in a basic book of plant physiology. Look for these references in your university/lab library :