Sigalingging, Ganda, 		Ferdiyanti, Ferdiyanti, AND 		Asniar, Asniar.
" HUBUNGAN SENAM HAMIL DENGAN LAMA PERSALINAN KALA II  DI RSIA STELA MARIS MEDAN" <em>JURNAL DARMA AGUNG HUSADA</em> [Online], Volume 8 Number 1 (30 March 2021)