The Memory of the Righteous is [for] a Blessing: Taanit 28a
Using the phrase, "May I be a method of forgiveness for the deceased": Succah 20a; Kiddushin 31b
Adding to the name of the deceased, "Menuchato Kavod - May his rest be in honor": R. Succah 40a "Aitzim deHasakah"
Adding to the name of the deceased, "May his memory be for a blessing for life in the World to Come: Kiddushin 31b
Fasting on the anniversary of a parent's death: Nedarim 12a