There are numerous websites that provide Italian biscotti recipes from professional chefs, like Food Network or Lidia's Italy. These sites offer recipes that have either appeared in television cooking shows, magazines or cook books. These types of recipe sites often offer videos of the chefs making the recipes, which can be more helpful to some home cooks than reading a recipe is.
Some of the sites that offer Italian biscotti recipes are user submitted so may not be as accurate as the ones produced and offered by the professional cooking shows or chefs. You can find some biscotti recipes from companies like King Arthur Flour, who produce goods used in baking and have their own test kitchens where recipes are tested and created to offer their consumers. Many of these recipes are found on the bags of flour or the boxes that their products are sold in. With the more common use of the internet to find recipes, these companies have broadened their offering of recipes by putting them online. The Italian biscotti is one of the most popular, but it is not the only version of biscotti out there. There are chocolate versions, bite-size ones and even ones that call for less traditional ingredients like figs or cherries. Biscotti is a cookie that can be adapted or changed to meet nutritional needs, such as gluten free, or just personal tastes.