Thanks to the depth of his field work, van der Loon not only counts many friends among the people but also possesses a host of audio tapes, Taoist texts, folk opera booklets, rare editions, records of oral narratives, and other precious materials that domestic scholars may never even have heard of.
正因為「田野調查」的工夫下得深，龍彼得不僅擁有許多民間友人，也有許多國內學者「聽所未聽、聞所未聞」的資料﹘ ﹘錄音帶、道士戲文、歌仔冊、各種珍貴版本、口述文獻…… 等等。