APA
W.H.O.T.R.S.804, . (1990). Cancer pain relief and palliactive care. W.H.O., Geneva: .
Chicago
W.H.O.T.R.S.804, . 1990. Cancer pain relief and palliactive care. W.H.O., Geneva: .
Harvard
W.H.O.T.R.S.804, . (1990). Cancer pain relief and palliactive care. W.H.O., Geneva: .
MLA
W.H.O.T.R.S.804, . Cancer pain relief and palliactive care. W.H.O., Geneva: . 1990.