Print text at the next line. The spacing between lines is determined by the leading parameter.

Vol. 6, p. 140 (1960) (describing British declaration that the First World War abrogated a treaty, leading to British acquisition of Cyprus).

The options parameter may contain the following elements individual characters, and characters followed by a colon to indicate an option argument is to follow. For example, an option string x recognizes an option x, and an option string x recognizes an option and argument x argument. It does not matter if an argument has leading white space.