Παραπομπή APA

Van Ggch, J. P. (1974). Applied general system theory. Harper and row.

Παραπομπή Chicago Style

Van Ggch, John P. Applied General System Theory. NewYork: Harper and row, 1974.

Παραπομπή MLA

Van Ggch, John P. Applied General System Theory. Harper and row, 1974.