Here is a suggested format for bibliographic citation of papers published in the SILe-Books series (parts in italics are replaced by specific information):
Author. Year. Book Title. SIL e-Books Issue Number. Dallas: SIL International. Online. URL: URL. Access date.
Black. H. Andrew. 2006. Constraint-ranked derivation: A serial approach to optimization. SIL e-Books 1. Dallas: SIL International. Online. URL: http://www.sil.org/silepubs/abstract.asp?id=47751. Accessed on 20 January, 2007.
The URL may also be enclosed by angled brackets, like this: