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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:8715 – Isḥāq b. Ibrāhīm > ʿAbd al-Razzāq > al-Thawrī > Abū Isḥāq > al-Aswad > ʿAbdullāh

[Machine] "If prostration is the conclusion of the chapter, then if you wish, you may perform a complete unit of prayer and if you wish, you may prostrate."  

الطبراني:٨٧١٥ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ عَنْ عَبْدِ الرَّزَّاقِ عَنِ الثَّوْرِيِّ عَنْ أَبِي إِسْحَاقَ عَنِ الْأَسْوَدِ عَنْ عَبْدِ اللهِ قَالَ

«إِذَا كَانَتِ السَّجْدَةُ خَاتِمَةَ السُّورَةِ فَإِنْ شِئْتَ رَكَعْتَ وَإِنْ شِئْتَ سَجَدْتَ»  

See similar narrations below:

Collected by Bayhaqī
bayhaqi:3763 – Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās > Usayd b. ʿĀṣim > al-Ḥusayn b. Ḥafṣ > Sufyān > Abū Isḥāq > al-Aswad > ʿAbdullāh b. Masʿūd

[Machine] He said, "If the prostration (sujood) is at the end of the surah, then he may choose to perform a bowing (raka'a) or prostration (sujood)."  

البيهقي:٣٧٦٣ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو قَالَا ثنا أَبُو الْعَبَّاسِ ثنا أُسَيْدُ بْنُ عَاصِمٍ ثنا الْحُسَيْنُ بْنُ حَفْصٍ عَنْ سُفْيَانَ عَنْ أَبِي إِسْحَاقَ عَنِ الْأَسْوَدِ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ

أَنَّهُ قَالَ إِذَا كَانَتِ السَّجْدَةُ فِي آخِرِ السُّورَةِ فَإِنْ شَاءَ رَكَعَ وَإِنْ شَاءَ سَجَدَ