American Psychological Association 6th edition

YAPA, N. U. (1997, Januar 1). PURNA-AGRINET : Integrated information system of Sri Lanka. 42(3-4). Wallingford: International Association of Agricultural Information Specialists, 1997. Abgerufen von http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=2394004

ISO-690 (author-date, English)

YAPA, N. U, 1997. PURNA-AGRINET : Integrated information system of Sri Lanka. In: [online]. Wallingford: International Association of Agricultural Information Specialists, 1997. 1 Januar 1997. Available from: http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=2394004

Modern Language Association 9th edition

YAPA, N. U. PURNA-AGRINET : Integrated information system of Sri Lanka. Nr. 3-4, Wallingford: International Association of Agricultural Information Specialists, 1997., 1997, http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=2394004.

Mohr Siebeck - Recht (Deutsch - Österreich)

Emerald - Harvard

YAPA, N.U. (1997), „PURNA-AGRINET : Integrated information system of Sri Lanka“, in , Bd. 42, Wallingford: International Association of Agricultural Information Specialists, 1997., verfügbar unter: http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=2394004.

Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.