Gaya APA

Coombs, M, T, &, F. (1988). The spiritual journey, critical thresholds and stages of adult spiritual Genesis. . Wilmington: Glazier.

Gaya MLA

Coombs, Marie, Theresa,Hermit, &, Fr.K.Nemeck,OMI.. "The spiritual journey, critical thresholds and stages of adult spiritual Genesis. ". Wilmington: Glazier, 1988. Buku.