APA

United States, . (1988). Senior Executive Service: the extent to which SES members have used the sabbatical program. [Washington, D.C: .

Chicago

United States, . 1988. Senior Executive Service: the extent to which SES members have used the sabbatical program. [Washington, D.C: .

Harvard

United States, . (1988). Senior Executive Service: the extent to which SES members have used the sabbatical program. [Washington, D.C: .

MLA

United States, . Senior Executive Service: the extent to which SES members have used the sabbatical program. [Washington, D.C: . 1988.