It sounds to me as if he's an on-the-go kind of guy and just doesn't want the day to end. Try giving him simple choices. "It's time to read a book now. Do you want to read it on the couch or on your bed?" That way he has some control over the situation, even if he can't change the fact that he's going to bed.
Also, you can change him into pj's earlier, and let him stay up some AFTER changing -- like change him 1/2 hour early or something. That way, getting changed isn't hassled by tears and stuff. Then he gets to play a little more, then a book, and then perhaps he'd like to listen to music while he goes to sleep ? Our kids had some great kids' songs tapes (it was before CD's !) and I'm sure there are still some around that are imaginative and fun to listen to. You can ask him if he'd like to play his songs while he's in bed. Hug him, turn them on, and let him go to sleep.
OOPSIE ! Your guy is only 13 months old. Okay, what I did at that age was to hold my kids and bounce them some, and sing to them until they were already asleep. THEN I put them in bed. They didn't go to bed until at least 8:00, and maybe later then -- cuz they were really on my schedule. And yes, I started sooner than they fell asleep, and sometimes they cried while we walked and bounced around the house, but they went to sleep in my arms. THEN they went to bed. I was just never good at having them cry it out. If they wanted to land in the crib, they would generally lean down toward the bed, but if not, they'd just hang onto Mom, and we'd keep up the routine until they did fall asleep.
Not much help, huh ? Aging helps the most. So while he's young, you have to work up a routine that works for you, allowing you to spend hug-time you don't get during the workday, and giving you enough rest to be able to accomplish both your job and motherhood. :-) Good luck. And enjoy it. Amazingly they grow up. My oldest is 28, and my youngest is 13. None of them get rocked to sleep, or sung to sleep, and now they hardly ever get tucked in, either. So relish the moments, even if they are frustrating when you are exhausted.