be effective

References in classic literature ?
A ruin must be rightly situated, to be effective. This one could not have been better placed.
Hunt, for he knew not how far it might be effective among his men.
Nor with such a man could you expect the appeal to conscience to be effective. You might as well ask for a reflection without a mirror.
Describe your leadership style and explain how you think that will be effective in producing actions and decisions with your city council.
As promulgated, the revised section 482 services regulations would generally be effective for taxable years beginning after December 31, 2006.
The main lesson learned from Singapore's experience is that for a vector control program to be effective, it must be based on carefully collected and analyzed epidemiologic and entomologic surveillance data, with particular emphasis on ecologic factors that determine where, how, and when to initiate vector control, which Chan termed "vector epidemiology" (7).
To be effective, we must focus, at all levels, on attracting members and engaging organizations interested in increasing the extent of public debate and in ensuring that the electoral and political process is open and accessible to all.
While doing that, I have identified a number of key principles I believe we must follow to be effective that I would like to share with you.
Despite many counselors having the required courses and practicum experiences, they still may not have the necessary qualities to be effective counselors.
Also, I believe that audit committees are performing at a much higher level than they have historically, [and] I'm pleased that audit committees understand their role, and that they are working assertively and aggressively to be effective as they provide their oversight of the financial reporting process.
(17) Intravenous lidocaine has been reported to be effective in treating tinnitus, (12,17,18) but it carries serious potential side effects, its half-life is very short, and no effective oral formulation has been found.