註腳
Alf Sommerfelt，〈Initial Mutations in Celtic〉，《中央研究院歷史語言研究所集刊》29上（1957）：283-285。
Alf Sommerfelt, “Initial Mutations in Celtic,” Bulletin of the Institute of History and Philology, Academia Sinica 29.1 (1957): 283-285.
書目
Sommerfelt, Alf
1957 〈Initial Mutations in Celtic〉，《中央研究院歷史語言研究所集刊》29上：283-285。
Sommerfelt, Alf
1957 “Initial Mutations in Celtic.” Bulletin of the Institute of History and Philology, Academia Sinica 29.1: 283-285.
Sommerfelt, Alf. (1957). Initial Mutations in Celtic. 中央研究院歷史語言研究所集刊, 29(上), 283-285.
Sommerfelt, Alf. (1957). Initial Mutations in Celtic. Bulletin of the Institute of History and Philology, Academia Sinica, 29(1), 283-285.
Sommerfelt, Alf. “Initial Mutations in Celtic.” 中央研究院歷史語言研究所集刊 29, no. 上 (1957): 283-285.
Sommerfelt, Alf. “Initial Mutations in Celtic.” Bulletin of the Institute of History and Philology, Academia Sinica 29, no. 1 (1957): 283-285.
Sommerfelt, Alf. “Initial Mutations in Celtic.” 中央研究院歷史語言研究所集刊, vol. 29, no. 上, 1957, pp. 283-285.
Sommerfelt, Alf. “Initial Mutations in Celtic.” Bulletin of the Institute of History and Philology, Academia Sinica, vol. 29, no. 1, 1957, pp. 283-285.
