Fraterna : official bulletin for International Hoya Association - International Hoya Association. (The Association, 1991)

Fraterna : official bulletin for International Hoya Association - International Hoya Association. (The Association, 1992)

Fraterna : official bulletin for International Hoya Association - International Hoya Association. (The Association, 1993)

Fraterna : official bulletin for International Hoya Association - International Hoya Association. (The Association, 1994)

Fraterna : official bulletin for International Hoya Association - International Hoya Association. (The Association, 1995)