Soltis, Andrew (1993) [1987]. The Stonewall Attack (Revised 2nd изд.). Chess Digest, Inc. стр. 20. ISBN0-87568-165-4. „In this book we'll consider the most common sequence: 1.d4 followed by 2.e3 and then 3.Bd3 and 4.f4 (or 3.f4 and 4.Bd3). But the Stonewall has materialized in quite a variety of sequences, including 1.f4 in the hands of Bent Larsen, Gideon Stahlberg and Harry Bird, or even 1.Nf3.”
web.archive.org
Larry Evans (децембар 1981). „Stonewalling”. Chess Life. стр. 34—36. Архивирано из оригинала 25. 4. 2012. г. Приступљено 16. 10. 2011.CS1 одржавање: Неподобан URL (веза)
