Codex: Chaos (1996), p61

Khorne shall be called with blood.
Aksho Kharneth Akhash

Slaanesh shall be called with anguish.
Aksho Slaaneth K'khaa

Tzeentch shall be called with fire.
Aksho Tzeeneth Phaos

Nurgle shall be called with death.
Aksho Nurgleth Dh'Akh

The door is unlocked, Daemons of Chaos I call thee forth.
Ksy'Iakash Dhaos Akhamshy'y Khaos Akso'mi!