If by "guide" you mean guide service, can't help you on that. If you mean books, here's what I found by looking through guidebooks here (the usual outdoor stores, DeLorme and Mobil Book Fair in Newton) and in the Canadian Rockies:
Classic Hikes in the Candian Rockies by Graeme Pole (advertised as "the 63 best hikes in the Rockies")
Popular Day Hikes 2 Canadian Rockies by Tony Daffern (I especially like the photographs in this guide)
Canadian Rockies Trail Guide by Brian Patton & Bart Robinson (8th edition which says something in itself)
My favored trail maps are "hiking maps and guides" by Gem Trek Publishing and used three of them: Banff/Egypt Lake, Jasper and Malign Lake, and Lake Louise & Yoho.
I've seen the guide that peakbagger mentioned and have heard others comment on it favorably but it wasn't the kind of book that I generally find useful ... don't ask me why ... it just didn't strike me as helpful as the others in my trip planning. Any reference is better than none but the three I list were most appealing to the way I plan a trip.
I found the Lonely Planet guidebook on Banff, Jasper & Glacier very helpful. It does note popular hikes and I found it useful for identifying other atttractions. accommodations, restaurants etc. Be prepared that the Canadian Rockies, having such an international market appeal, is very expensive ... more so than comparable facilities elsewhere. We enjoyed a couple hostels during our stay and the cost helped balance out other more expensive accommodations.
Make your reservations early as the best places book up fast. Lake O'Hare in Yoho comes to mind.
We approached our trip as a familiarization of the different parks in the area, excluding Kootenay as that would have spread us too thin in the 1 1/2 weeks we had available. Our research focused us on Jasper and Yoho over Banff and while we spent time in all three, were reinforced on the ground by that priority. Pressed, I think I would select Yoho as our primary destination next time. We also visited Waterton and Glacier (US) but they are too far out of the way if you are flying out.
A few places that we enjoyed which you might consider:
Takakaw Falls (Yoho) - nearby Whiskey Jack Hostel in view and earshot of 800' + falls, Iceline Trail, Yoho Pass Trail to Emerald Lake
Emerald Lake (Yoho) - trail around lake has both Rocky Mountain and NW rainforest environments and Emerald Basin Trail
Lake Louise (Banff) - Lake Agnes Trail including Little Beehive, Big Beehive and Mt. St. Piran
Maligne Lake (Jasper) - Maligne Canyon Hostel, Bald Hills Trails, Opal Hills Trail, Skyline Trail, good family acclimitization hike on Old Fort Point Trail loop
Cavell Meadows/Mount Edith Cavell (Jasper) - Meadows Trail to lake noted mainly as a source of glacial ice (and prehistoric dust) for my bourbon
Bow River and Vermillion Lakes (Banff) - kayak rentals and flatwater paddling at the edge of Banff town
Columbia Icefields/Athabasca Glacier (Jasper)
Johnston Canyon (Banff)
P.S. As for Mt. Little, I know nothing about it and none of my guidebooks mention it.