《资治通鉴·宋纪·宋纪三》
杨难当坚决拒绝接受，请求立杨玄的儿子杨保宗继承大位，他自己辅佐侄子，杨玄同意。
难当固辞，请立玄子保宗而辅之；玄许之。
Yang Nanddang firmly refused to accept and asked to establish Yang Xuan's son, Yang Baozong, as the heir, and he himself would assist his nephew. Yang Xuan agreed.