The Past Through Tomorrow
Time Enough For Love
If you want to read the ENTIRE saga, you'd have to do a LOT more reading, and pick up
The Number of the Beast
The Rolling Stones
The Cat Who Walked Through Walls
and Stranger In A Strange Land
You have to do all this reading because the final book of the saga, To Sail Beyond The Sunset includes characters from all those novels (and may even include others I've forgotten about at the moment).
In any case, they are all available, and I wish you happy reading! (Oh, how I wish I could go back and read them all again like the first time...I envy anyone who can still do so.)
Regards,