Recipe plagiarism?

I have a blog that I have been working on for a while. I have recipes from my mother that have been "passed down" that have no source, I have recipes from friends, cookbooks, and online. All of the recipes I have tried and even have pictures of. The recipes I have found online, I have sited the source and included the link to the website. I have also done the same if it came from a cook book.

I am not charging for these recipes, but I do have google adsense and other affiliate links on my site. I have seen other people do the same with their blogs. Is this plagiarism? I am NOT trying to pass the recipes off as my own.

How do you really commit recipe plagiarism? I am sure there are thousands of stew, chili, cookie, brownie, etc, recipes out there. I am sure at one point someone's grandmother got a cookie recipe off of a box, added some vanilla and said it was their family secret. I have seen a few sites where it lists the ingredients and directions word for word. Thanks.

Several websites that had famous restuarants' secret recipes have disappeared. I don't know why but I can guess.

Can I copyright a recipe? – Legal Issues – Ask Entrepreneur

http://www.entrepreneur.com/ask/answer774.html

Can a Recipe Be Stolen? – washingtonpost.com

http://www.washingtonpost.com/wp-dyn/content/article/2006/01/03/AR2006010300316.html

New Era of the Recipe Burglar
"But I think serious recipes really are a form of literary craftsmanship. You can copyright the world’s worst photograph, but you can’t copyright a recipe, or its expression as food? That’s absurd!"

http://www.foodandwine.com/articles/new-era-of-the-recipe-burglar