Secondary Dominants

Here you find the available secondary dominants in major and minor. What  is a secondary dominant ? This is a dominant which you find on any levels of the diatonic chord progression either in major or minor which resolves on a level of the major or minor diatonic chord progression. That's the basic rule - if you have any other dominant chord somewhere which does not fullfil this rule it is treated differently. 

The available modes of any secondary dominant relays to the original mode of the level you find the secondary placed on. As an example : 

V7 / IV in major : The original mode is ionian. The nearest available dominant mode is mixolydian
V7 / VI in major : The original mode is phyrgian. The nearest available dominant mode is phyrgian nat. 3