Summers, F. W., & Summers, L. (1991). Library Leadership 2000 and Beyond: Snowbird Leadership Institute.
Citazione stile Chigago Style (17a edizione)Summers, F. William, e Lorraine Summers. Library Leadership 2000 and Beyond: Snowbird Leadership Institute. 1991.
Citatione MLA (9a ed.)Summers, F. William, e Lorraine Summers. Library Leadership 2000 and Beyond: Snowbird Leadership Institute. 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.