Production staff for the weekly fashion magazine Grazia edit in 2008 in London. Employee Appreciation Day is Friday. Getty Images

There are more than 144 million workers in the United States, which means you almost definitely know someone you should be thanking Friday for Employee Appreciation Day.

Employee Appreciation Day, an unofficial annual observance celebrated every year since 1995, is a chance for bosses to recognize their staffers. If you’re head honcho, suggests you consider bringing in doughnuts or letting your employees go home early on this special occasion.

Alternatively, you can hand out thank-you cards with inspirational and appreciative notes written inside. Here are a few famous quotes you can use to make your workers feel valued Friday, collected from Thank You Diva, Causecast and FrontStream:

“I have always believed that the way you treat your employees is the way they will treat your customers, and that people flourish when they are praised.” — Sir Richard Branson

“Brand is how others see you, culture is how you see yourself.” — Curt Coffman

“The only way to do great work is to love what you do.” — Steve Jobs

“A group of people get together and exist as an institution we call a company so they are able to accomplish something collectively that they could not accomplish separately — they make a contribution to society, a phrase which sounds trite but is fundamental.” — David Packard

“The best executive is one who has sense enough to pick good people to do what he wants done and self-restraint enough to keep from meddling with them while they do it.” — Theodore Roosevelt

“Dream more than others think practical. Expect more than others think possible.” — Howard Schultz

“Work is not man’s punishment. It is his reward and his strength and his pleasure.” — George Sand

“Your number one customers are your people. Look after employees first and then customers last.” — Ian Hutchinson

“When people go to work, they shouldn’t have to leave their hearts at home.” — Betty Bender

“No duty is more urgent than that of returning thanks.” — James Allen

If you’d rather go with a more general saying, try one of these, from CardsDirect and WishesMessages:

“Giving you this thank you note is an instruction that my heart has asked me to follow, not the HR department. Thanks.”

“I’ll bet you didn’t think anyone noticed all that you do. That’s why it’s important that I take this moment to say thanks so much.”

“If your perseverance and integrity were contagious diseases, everyone at work would be as perfect as you. Thanks for doing a good job.”

“No job is too big or too small for you. Thanks for always jumping in and helping out.”

“My words can never be enough to praise your actions because your work always meets my expectations. Thank you.”

“You are so irreplaceable to this company that it makes me wonder whether you are my greatest strength or greatest weakness. Thanks.”