Books about Friendship -- Juvenile fiction (sorted alphabetically)
- Kit of Greenacre Farm Izola L. Forrester
- Knights of the White Shield Edward A. Rand
- Kun me olimme tyttöjä (Finnish) Sarah Doudney
- Lady Jane C. V. Jamison
- Land of Oz L. Frank Baum
- Larkspur Jane Abbott
- Letty and the Twins Helen Sherman Griffith
- Life's Eclipse George Manville Fenn
- Little Alfred L. A. Holdich
- Little Bessie, the Careless Girl, or, Squirrels, Nuts, and Water-Cresses Josephine Franklin
- Little Colonel in Arizona Annie F. Johnston
- Little Dusky Hero Harriet T. Comstock
- Little Homespun Ruth Ogden
- Little Maid of Province Town Alice Turner Curtis
- Little Pollie Gertrude P. Dyer
- Little Queen of Hearts: An International Story Ruth Ogden
- lively adventures of Gavin Hamilton Molly Elliot Seawell
- Lost Middy: Being the Secret of the Smugglers' Gap George Manville Fenn
- Lost Princess of Oz L. Frank Baum
- Lost Princess of Oz L. Frank Baum
- Lost Princess of Oz L. Frank Baum
- Loyal Little Red-Coat: A Story of Child-life in New York a Hundred Years Ago Ruth Ogden
- Madge Morton, Captain of the Merry Maid Amy D. V. Chalmers
- Madge Morton's Secret Amy D. V. Chalmers
- Madge Morton's Trust Amy D. V. Chalmers